$wat 2011 Q1 10-K

Concept	2011 Q1	2009 Q4	2009 Q3
Revenue		$428.8M	$362.8M
YoY Change		2.52%	-6.07%
Cost Of Revenue		$170.1M	$144.2M
YoY Change		-1.14%	-9.05%
Gross Profit		$258.7M	$218.7M
YoY Change		5.04%	-4.0%
Gross Profit Margin		60.33%	60.27%
Selling, General & Admin		$110.0M	$109.6M
YoY Change		8.36%	1.94%
% of Gross Profit		42.51%	50.11%
Research & Development		$19.79M	$19.72M
YoY Change		0.97%	-0.89%
% of Gross Profit		7.65%	9.02%
Depreciation & Amortization		$13.70M	$14.50M
YoY Change		7.03%	5.84%
% of Gross Profit		5.3%	6.63%
Operating Expenses		$129.8M	$129.3M
YoY Change		5.17%	-0.38%
Operating Profit		$126.3M	$86.70M
YoY Change		2.77%	-11.54%
Interest Expense		$2.343M	$2.649M
YoY Change		-160.08%	-158.87%
% of Operating Profit		1.86%	3.06%
Other Income/Expense, Net
YoY Change
Pretax Income		$124.7M	$84.64M
YoY Change		10.95%	-9.47%
Income Tax		$20.59M	$14.73M
% Of Pretax Income		16.51%	17.41%
Net Earnings		$75.90M	$69.90M
YoY Change		-23.64%	-2.24%
Net Earnings / Revenue		17.7%	19.26%
Basic Earnings Per Share
Diluted Earnings Per Share		$786.5K	$720.6K
COMMON SHARES
Basic Shares Outstanding	91.33M shares	94.52M shares	96.15M shares
Diluted Shares Outstanding		96.11M shares	97.00M shares

Concept	2009 Q4	2009 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$578.1M	$505.7M
YoY Change	34.91%	-43.35%
Cash & Equivalents	$341.1M	$358.4M
Short-Term Investments	$187.7M	$147.2M
Other Short-Term Assets	$49.21M	$61.30M
YoY Change	-21.9%	33.55%
Inventory	$178.7M	$196.3M
Prepaid Expenses
Receivables	$314.2M	$294.9M
Other Receivables	$0.00	$0.00
Total Short-Term Assets	$1.172B	$1.058B
YoY Change	22.6%	-26.2%
LONG-TERM ASSETS
Property, Plant & Equipment	$210.9M	$203.3M
YoY Change	22.92%	22.03%
Goodwill	$293.1M
YoY Change	9.36%
Intangibles	$182.2M
YoY Change
Long-Term Investments
YoY Change
Other Assets	$49.39M	$71.30M
YoY Change	-35.86%	-13.47%
Total Long-Term Assets	$735.6M	$744.3M
YoY Change	10.34%	11.12%
TOTAL ASSETS
Total Short-Term Assets	$1.172B	$1.058B
Total Long-Term Assets	$735.6M	$744.3M
Total Assets	$1.908B	$1.803B
YoY Change	17.56%	-14.32%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$49.57M	$51.30M
YoY Change	5.03%	-6.73%
Accrued Expenses	$45.10M	$39.70M
YoY Change	-16.17%	-30.59%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due	$144.7M	$130.8M
YoY Change	300.83%	-65.35%
Total Short-Term Liabilities	$394.6M	$400.1M
YoY Change	36.29%	-39.94%
LONG-TERM LIABILITIES
Long-Term Debt	$500.0M	$500.0M
YoY Change	0.0%	-23.08%
Other Long-Term Liabilities	$22.77M	$93.00M
YoY Change	-75.28%	46.0%
Total Long-Term Liabilities	$664.4M	$593.0M
YoY Change	12.21%	-16.91%
TOTAL LIABILITIES
Total Short-Term Liabilities	$394.6M	$400.1M
Total Long-Term Liabilities	$664.4M	$593.0M
Total Liabilities	$1.059B	$1.072B
YoY Change	10.09%	-26.52%
SHAREHOLDERS EQUITY
Retained Earnings	$2.237B
YoY Change
Common Stock	$809.8M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.213B
YoY Change
Treasury Stock Shares	54.71M shares
Shareholders Equity	$848.9M	$730.7M
YoY Change
Total Liabilities & Shareholders Equity	$1.908B	$1.803B
YoY Change	17.56%	-14.32%

Concept	2009 Q4	2009 Q3
OPERATING ACTIVITIES
Net Income	$75.90M	$69.90M
YoY Change	-23.64%	-2.24%
Depreciation, Depletion And Amortization	$13.70M	$14.50M
YoY Change	7.03%	5.84%
Cash From Operating Activities	$124.6M	$93.10M
YoY Change	11.05%	-9.35%
INVESTING ACTIVITIES
Capital Expenditures	-$22.60M	-$35.60M
YoY Change	13.0%	115.76%
Acquisitions
YoY Change
Other Investing Activities	-$40.50M	-$104.1M
YoY Change	743.75%	3370.0%
Cash From Investing Activities	-$63.10M	-$139.7M
YoY Change	154.44%	616.41%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-34.00M	8.100M
YoY Change	-93.61%	-202.53%
NET CHANGE
Cash From Operating Activities	124.6M	93.10M
Cash From Investing Activities	-63.10M	-139.7M
Cash From Financing Activities	-34.00M	8.100M
Net Change In Cash	27.50M	-38.50M
YoY Change	-106.19%	-151.13%
FREE CASH FLOW
Cash From Operating Activities	$124.6M	$93.10M
Capital Expenditures	-$22.60M	-$35.60M
Free Cash Flow	$147.2M	$128.7M
YoY Change	11.35%	7.97%

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2010	dei	Entity Registrant Name EntityRegistrantName	WATERS CORP /DE/
CY2010	dei	Entity Central Index Key EntityCentralIndexKey	0001000697
CY2010	dei	Document Type DocumentType	10-K
CY2010	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2010	dei	Amendment Flag AmendmentFlag	false
CY2010	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2010
CY2010	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2010	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2010	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2010	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2010	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2010Q3	dei	Entity Public Float EntityPublicFloat	5807530824	USD
CY2010	dei	Document Period End Date DocumentPeriodEndDate	2010-12-31
CY2011Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	91325148	shares
CY2010	wat	Percent Of Net Sales To Pharmaceutical Industry PercentOfNetSalesToPharmaceuticalIndustry	0.52	pure
CY2009	wat	Percent Of Net Sales To Pharmaceutical Industry PercentOfNetSalesToPharmaceuticalIndustry	0.51	pure
CY2008	wat	Percent Of Net Sales To Pharmaceutical Industry PercentOfNetSalesToPharmaceuticalIndustry	0.50	pure
CY2010	wat	Maximum Percentage Of Net Sales To Individual Customer MaximumPercentageOfNetSalesToIndividualCustomer	0.03	pure
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	308498000	USD
CY2010Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	358237000	USD
CY2010Q4	us-gaap	Inventory Net InventoryNet	204300000	USD
CY2010Q4	us-gaap	Other Assets Current OtherAssetsCurrent	77685000	USD
CY2010Q4	us-gaap	Assets Current AssetsCurrent	1586641000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	215060000	USD
CY2010Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	181316000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	291657000	USD
CY2010Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	52996000	USD
CY2010Q4	us-gaap	Assets Assets	2327670000	USD
CY2010Q4	us-gaap	Debt Current DebtCurrent	66055000	USD
CY2009Q4	us-gaap	Debt Current DebtCurrent	131772000	USD
CY2010Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	64406000	USD
CY2009Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	49573000	USD
CY2010Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	52831000	USD
CY2009Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	37050000	USD
CY2010Q4	us-gaap	Deferred Revenue And Credits Current DeferredRevenueAndCreditsCurrent	106445000	USD
CY2009Q4	us-gaap	Deferred Revenue And Credits Current DeferredRevenueAndCreditsCurrent	94680000	USD
CY2010Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	11909000	USD
CY2009Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	13267000	USD
CY2010Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	11272000	USD
CY2009Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	10109000	USD
CY2010Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	72932000	USD
CY2009Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2236716000	USD
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2509466000	USD
CY2009Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	58117000	USD
CY2010Q4	us-gaap	Liabilities Current LiabilitiesCurrent	385850000	USD
CY2009Q4	us-gaap	Liabilities Current LiabilitiesCurrent	394568000	USD
CY2010Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	700000000	USD
CY2009Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	500000000	USD
CY2010Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	72624000	USD
CY2009Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	69044000	USD
CY2010Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	77764000	USD
CY2009Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	72604000	USD
CY2010Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	22635000	USD
CY2009Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	22766000	USD
CY2010Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	873023000	USD
CY2009Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	664414000	USD
CY2010Q4	us-gaap	Liabilities Liabilities	1258873000	USD
CY2009Q4	us-gaap	Liabilities Liabilities	1058982000	USD
CY2010Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2009Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	1511000	USD
CY2009Q4	us-gaap	Common Stock Value CommonStockValue	1488000	USD
CY2010Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	970068000	USD
CY2009Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	808345000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2618479000	USD
CY2009Q4	us-gaap	Treasury Stock Value TreasuryStockValue	2213174000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-11795000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	15574000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	1068797000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	848949000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2327670000	USD
CY2009Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1907931000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	341111000	USD
CY2009Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	314247000	USD
CY2009Q4	us-gaap	Inventory Net InventoryNet	178666000	USD
CY2009Q4	us-gaap	Other Assets Current OtherAssetsCurrent	49206000	USD
CY2009Q4	us-gaap	Assets Current AssetsCurrent	1172376000	USD
CY2009Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	210926000	USD
CY2009Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	182165000	USD
CY2009Q4	us-gaap	Goodwill Goodwill	293077000	USD
CY2009Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	49387000	USD
CY2009Q4	us-gaap	Assets Assets	1907931000	USD
CY2010Q4	wat	Allowances For Doubtful Accounts And Sales Returns AllowancesForDoubtfulAccountsAndSalesReturns	6196000	USD
CY2010Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2010Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
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CY2010Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
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CY2010Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	59206000	shares
CY2009Q4	wat	Allowances For Doubtful Accounts And Sales Returns AllowancesForDoubtfulAccountsAndSalesReturns	6723000	USD
CY2009Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
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CY2009Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2009Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	54713000	shares
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CY2010	us-gaap	Commitments And Contingencies2009 CommitmentsAndContingencies2009
CY2009	us-gaap	Commitments And Contingencies2009 CommitmentsAndContingencies2009
CY2010	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	1166627000	USD
CY2010	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	476744000	USD
CY2010	us-gaap	Sales Revenue Net SalesRevenueNet	1643371000	USD
CY2010	us-gaap	Cost Of Goods Sold CostOfGoodsSold	453779000	USD
CY2010	us-gaap	Cost Of Services CostOfServices	199524000	USD
CY2010	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	653303000	USD
CY2010	us-gaap	Gross Profit GrossProfit	990068000	USD
CY2010	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	445456000	USD
CY2010	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	84274000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	449932000	USD
CY2010	us-gaap	Interest Expense InterestExpense	13924000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	1855000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	437863000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	56100000	USD
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CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.13
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CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	94057000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	96862000	shares
CY2009	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.34
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CY2009	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.37
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CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63339000	USD
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CY2009	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	77154000	USD
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CY2009	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	594882000	USD
CY2009	us-gaap	Cost Of Services CostOfServices	188201000	USD
CY2009	us-gaap	Cost Of Goods Sold CostOfGoodsSold	406681000	USD
CY2009	us-gaap	Sales Revenue Net SalesRevenueNet	1498700000	USD
CY2010	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	8138000	USD
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CY2009	wat	Purchased Intangibles Amortization PurchasedIntangiblesAmortization	10659000	USD
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CY2008	us-gaap	Interest Expense InterestExpense	38521000	USD
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CY2008	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.21
CY2008	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	100555000	shares
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CY2008	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.134	pure
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CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	24852000	USD
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CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	43286000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	37036000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2402000	USD
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CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	52017000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	3895000	USD
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CY2010	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	62740000	USD
CY2010	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	1234671000	USD
CY2010	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	885896000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-411515000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	315641000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	181358000	USD
CY2010	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1498000	USD
CY2010	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	100584000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	296292000	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	10809000	USD
CY2009	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	-5162000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-90280000	USD
CY2009	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	3634000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-87411000	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	184309000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	92556000	USD
CY2009	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	19099000	USD
CY2009	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	211377000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-419028000	USD
CY2009	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	518390000	USD
CY2009	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	93796000	USD
CY2009	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	36086000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-10830000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-13220000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	418263000	USD
CY2009	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	16905000	USD
CY2009	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	6823000	USD
CY2009	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-5925000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	689000	USD
CY2009	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3124000	USD
CY2009	us-gaap	Inventory Write Down InventoryWriteDown	9952000	USD
CY2009	us-gaap	Share Based Compensation ShareBasedCompensation	28255000	USD
CY2009	us-gaap	Depreciation Depreciation	31805000	USD
CY2009	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	25467000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	428522000	USD
CY2010	wat	Increase In Deferred Revenue And Customer Advances IncreaseInDeferredRevenueAndCustomerAdvances	9433000	USD
CY2009	wat	Increase In Deferred Revenue And Customer Advances IncreaseInDeferredRevenueAndCustomerAdvances	2613000	USD
CY2010	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2009	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	229244000	USD
CY2009	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2009	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	5083000	USD
CY2008	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3924000	USD
CY2008	us-gaap	Inventory Write Down InventoryWriteDown	10632000	USD
CY2008	us-gaap	Share Based Compensation ShareBasedCompensation	30782000	USD
CY2008	us-gaap	Depreciation Depreciation	29071000	USD
CY2008	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	36200000	USD
CY2008	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-21739000	USD
CY2008	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	20618000	USD
CY2008	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	4633000	USD
CY2008	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-5180000	USD
CY2008	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-19970000	USD
CY2008	wat	Increase In Deferred Revenue And Customer Advances IncreaseInDeferredRevenueAndCustomerAdvances	1976000	USD
CY2008	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	21112000	USD
CY2008	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	418248000	USD
CY2008	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	69065000	USD
CY2008	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	7805000	USD
CY2008	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	19738000	USD
CY2008	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	115419000	USD
CY2008	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	18811000	USD
CY2008	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	469407000	USD
CY2008	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	817463000	USD
CY2008	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	501000	USD
CY2008	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	28646000	USD
CY2008	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	237500000	USD
CY2008	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	6669000	USD
CY2008	us-gaap	Payments For Proceeds From Hedge Financing Activities PaymentsForProceedsFromHedgeFinancingActivities	22196000	USD
CY2008	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-572938000	USD
CY2008	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-32932000	USD
CY2008	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-168811000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	39688000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	10564000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	23818000	USD
CY2009	us-gaap	Interest Paid Net InterestPaidNet	13020000	USD
CY2008	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	40571000	USD
CY2008	us-gaap	Interest Paid Net InterestPaidNet	44081000	USD
CY2007Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	597333000	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-15037000	USD
CY2009	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	36276000	USD
CY2008	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-19626000	USD
CY2007Q4	us-gaap	Stockholders Equity StockholdersEquity	586076000	USD
CY2008Q4	us-gaap	Stockholders Equity StockholdersEquity	661005000	USD
CY2007Q4	us-gaap	Shares Issued SharesIssued	147061000	shares
CY2010Q4	us-gaap	Shares Issued SharesIssued	151054000	shares
CY2008Q4	us-gaap	Shares Issued SharesIssued	148069000	shares
CY2009Q4	us-gaap	Shares Issued SharesIssued	148831000	shares
CY2010	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	62000	shares
CY2010	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	228000	shares
CY2009	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	88000	shares
CY2009	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	160000	shares
CY2009	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	514000	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	1933000	shares
CY2008	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	61000	shares
CY2008	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	825000	shares
CY2008	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	122000	shares
CY2008	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	3410000	USD
CY2009	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	3244000	USD
CY2010	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	3458000	USD
CY2008	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	25236000	USD
CY2009	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	15855000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	97126000	USD
CY2008	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	6669000	USD
CY2009	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	5083000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	10809000	USD
CY2008	wat	Adjustments To Additional Paid In Capital Increase In Valuation Allowance AdjustmentsToAdditionalPaidInCapitalIncreaseInValuationAllowance	1732000	USD
CY2009	wat	Adjustments To Additional Paid In Capital Increase In Valuation Allowance AdjustmentsToAdditionalPaidInCapitalIncreaseInValuationAllowance	705000	USD
CY2010	wat	Adjustments To Additional Paid In Capital Increase In Valuation Allowance AdjustmentsToAdditionalPaidInCapitalIncreaseInValuationAllowance	-25873000	USD
CY2008	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	31180000	USD
CY2009	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	28376000	USD
CY2010	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	24480000	USD
CY2008	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	237500000	USD
CY2009	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	211377000	USD
CY2010	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	296292000	USD
CY2010	us-gaap	Nature Of Operations NatureOfOperations	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">Waters Corporation (“Waters</font><font style="font-family:Times New Roman;font-size:10pt;">®</font><font style="font-family:Times New Roman;font-size:10pt;">” or the “Company”), an analytical instrument manufacturer, primarily designs, manufactures, sells and services, through its Waters Division, high performance liquid chromatography (“HPLC”), ultra performance liquid chromatography (“UPLC</font><font style="font-family:Times New Roman;font-size:10pt;">®</font><font style="font-family:Times New Roman;font-size:10pt;">” and together with HPLC, referred to as “LC”) and mass spectrometry (“MS”) instrument systems and support products, including chromatography columns, other consumable products and comprehensive post-warranty service plans. These systems are complementary products that can be integrated together and used along with other analytical instruments. LC is a standard technique and is utilized in a broad range of industries to detect, identify, monitor and measure the chemical, physical and biological composition of materials, and to purify a full range of compounds. MS instruments are used in drug discovery and development, including clinical trial testing, the analysis of proteins in disease processes (known as “proteomics”), food safety analysis and environmental testing. LC is often combined with MS to create LC-MS instruments that include a liquid phase sample introduction and separation system with mass spectrometric compound identification and quantification. Through its TA Division (“TA</font><font style="font-family:Times New Roman;font-size:10pt;">®</font><font style="font-family:Times New Roman;font-size:10pt;">”), the Company primarily designs, manufactures, sells and services thermal analysis, rheometry and calorimetry instruments, which are used in predicting the suitability of fine chemicals, polymers and viscous liquids for various industrial, consumer goods and healthcare products, as well as for life science research. The Company is also a developer and supplier of software-based products that interface with the Company's instruments and are typically purchased by customers as part of the instrument system.</font></p>
CY2010Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	87975000	USD
CY2007Q4	wat	Allowances For Doubtful Accounts And Sales Returns AllowancesForDoubtfulAccountsAndSalesReturns	9634000	USD
CY2010	wat	Additions To Allowance For Doubtful Accounts And Sales Returns AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns	5508000	USD
CY2010	wat	Deductions From Allowance For Doubtful Accounts And Sales Returns DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns	-6035000	USD
CY2008Q4	wat	Allowances For Doubtful Accounts And Sales Returns AllowancesForDoubtfulAccountsAndSalesReturns	7608000	USD
CY2009	wat	Additions To Allowance For Doubtful Accounts And Sales Returns AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns	6956000	USD
CY2009	wat	Deductions From Allowance For Doubtful Accounts And Sales Returns DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns	-7841000	USD
CY2008	wat	Additions To Allowance For Doubtful Accounts And Sales Returns AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns	5470000	USD
CY2008	wat	Deductions From Allowance For Doubtful Accounts And Sales Returns DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns	-7496000	USD
CY2009Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	0	USD
CY2009	wat	Cumulative Pre Tax Unrealized Gain Loss On Interest Rate Swap Agreements Recorded In Accumulated Other Comprehensive Income CumulativePreTaxUnrealizedGainLossOnInterestRateSwapAgreementsRecordedInAccumulatedOtherComprehensiveIncome	2000000	USD
CY2008	wat	Cumulative Pre Tax Unrealized Gain Loss On Interest Rate Swap Agreements Recorded In Accumulated Other Comprehensive Income CumulativePreTaxUnrealizedGainLossOnInterestRateSwapAgreementsRecordedInAccumulatedOtherComprehensiveIncome	-1000000	USD
CY2010Q4	us-gaap	Short Term Investments ShortTermInvestments	637921000	USD
CY2010Q4	us-gaap	Foreign Currency Fair Value Hedge Asset At Fair Value ForeignCurrencyFairValueHedgeAssetAtFairValue	424000	USD
CY2010Q4	wat	Fair Value Total Assets Measured On Recurring Basis FairValueTotalAssetsMeasuredOnRecurringBasis	746308000	USD
CY2010Q4	us-gaap	Foreign Currency Fair Value Hedge Liability At Fair Value ForeignCurrencyFairValueHedgeLiabilityAtFairValue	626000	USD
CY2010Q4	wat	Fair Value Total Liabilities Measured On Recurring Basis FairValueTotalLiabilitiesMeasuredOnRecurringBasis	626000	USD
CY2010Q4	wat	Waters Restoration Plan Assets WatersRestorationPlanAssets	19988000	USD
CY2009Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	181925000	USD
CY2009Q4	us-gaap	Short Term Investments ShortTermInvestments	289146000	USD
CY2009Q4	us-gaap	Foreign Currency Fair Value Hedge Asset At Fair Value ForeignCurrencyFairValueHedgeAssetAtFairValue	237000	USD
CY2009Q4	wat	Fair Value Total Assets Measured On Recurring Basis FairValueTotalAssetsMeasuredOnRecurringBasis	489263000	USD
CY2009Q4	us-gaap	Foreign Currency Fair Value Hedge Liability At Fair Value ForeignCurrencyFairValueHedgeLiabilityAtFairValue	400000	USD
CY2009Q4	wat	Fair Value Total Liabilities Measured On Recurring Basis FairValueTotalLiabilitiesMeasuredOnRecurringBasis	400000	USD
CY2009Q4	wat	Waters Restoration Plan Assets WatersRestorationPlanAssets	17955000	USD
CY2007Q3	wat	Contract Notional Amount Of Interest Rate Swap Agreements ContractNotionalAmountOfInterestRateSwapAgreements	50000000	USD
CY2010Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	0	USD
CY2009	wat	Additional Interest Expense Recorded From Interest Rate Swap Agreements AdditionalInterestExpenseRecordedFromInterestRateSwapAgreements	2000000	USD
CY2008	wat	Additional Interest Expense Recorded From Interest Rate Swap Agreements AdditionalInterestExpenseRecordedFromInterestRateSwapAgreements	1000000	USD
CY2010Q4	us-gaap	Notional Amount Of Foreign Currency Fair Value Hedge Derivatives NotionalAmountOfForeignCurrencyFairValueHedgeDerivatives	136000000	USD
CY2009Q4	us-gaap	Notional Amount Of Foreign Currency Fair Value Hedge Derivatives NotionalAmountOfForeignCurrencyFairValueHedgeDerivatives	138000000	USD
CY2010	wat	Cumulative Net Pre Tax Gains Losses On Forward Foreign Exchange Contracts CumulativeNetPreTaxGainsLossesOnForwardForeignExchangeContracts	-8000000	USD
CY2010	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	-8000000	USD
CY2010	us-gaap	Change In Unrealized Gain Loss On Foreign Currency Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnForeignCurrencyFairValueHedgingInstruments	0	USD
CY2009	wat	Cumulative Net Pre Tax Gains Losses On Forward Foreign Exchange Contracts CumulativeNetPreTaxGainsLossesOnForwardForeignExchangeContracts	7000000	USD
CY2009	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	5000000	USD
CY2009	us-gaap	Change In Unrealized Gain Loss On Foreign Currency Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnForeignCurrencyFairValueHedgingInstruments	2000000	USD
CY2008	wat	Cumulative Net Pre Tax Gains Losses On Forward Foreign Exchange Contracts CumulativeNetPreTaxGainsLossesOnForwardForeignExchangeContracts	-23000000	USD
CY2008	us-gaap	Gain Loss On Foreign Currency Fair Value Hedge Derivatives GainLossOnForeignCurrencyFairValueHedgeDerivatives	-22000000	USD
CY2008	us-gaap	Change In Unrealized Gain Loss On Foreign Currency Fair Value Hedging Instruments ChangeInUnrealizedGainLossOnForeignCurrencyFairValueHedgingInstruments	-1000000	USD
CY2008Q4	us-gaap	Notional Amount Of Foreign Currency Fair Value Hedge Derivatives NotionalAmountOfForeignCurrencyFairValueHedgeDerivatives	120000000	USD
CY2010Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights	120.00
CY2010Q4	wat	Preferred Share Purchase Rights Triggering Event PreferredSharePurchaseRightsTriggeringEvent	When a person or group actually has acquired 15% or more of Waters’ common stock, the Rights will then become exercisable for a number of shares of Waters’ common stock with a market value of twice the $120.00 exercise price of each Right.
CY2010Q4	wat	Preferred Share Purchase Rights Redemption Provision PreferredSharePurchaseRightsRedemptionProvision	The Board of Directors may redeem the Rights at a price of $0.001 per Right up until 10 days following a public announcement that any person or group has acquired 15% or more of the Company’s common stock.
CY2010Q4	wat	Preferred Share Purchase Rights Number Of Securities Called PreferredSharePurchaseRightsNumberOfSecuritiesCalled	When they first become exercisable, each Right will entitle its holder to buy from Waters one one-hundredth of a share of new Series A Junior Participating Preferred Stock (authorized limit of 4,000) for $120.00.
CY2010	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	7618000	USD
CY2010	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	-6455000	USD
CY2009	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	5725000	USD
CY2009	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	-5892000	USD
CY2008Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	10276000	USD
CY2007Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	13119000	USD
CY2008	us-gaap	Standard Product Warranty Accrual Warranties Issued StandardProductWarrantyAccrualWarrantiesIssued	9644000	USD
CY2008	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	-12487000	USD
CY2010	us-gaap	Advertising Expense AdvertisingExpense	10000000	USD
CY2009	us-gaap	Advertising Expense AdvertisingExpense	10000000	USD
CY2008	us-gaap	Advertising Expense AdvertisingExpense	9000000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	466425000	USD
CY2009Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	437891000	USD
CY2009Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	226965000	USD
CY2010Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	17301000	USD
CY2010Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	123524000	USD
CY2010	us-gaap	Property Plant And Equipment Disposals PropertyPlantAndEquipmentDisposals	9000000	USD
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
	wat	Irish Tax Rate IrishTaxRate	0.10	pure
CY2010Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	63475000	USD
CY2009Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	57223000	USD
CY2009Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	15419000	USD
CY2009Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	106024000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	251365000	USD
CY2009	us-gaap	Property Plant And Equipment Disposals PropertyPlantAndEquipmentDisposals	7000000	USD
CY2008	us-gaap	Property Plant And Equipment Disposals PropertyPlantAndEquipmentDisposals	9000000	USD
CY2010Q4	wat	Capitalized Costs For Sofware Developed For Internal Use CapitalizedCostsForSofwareDevelopedForInternalUse	4000000	USD
CY2009Q4	wat	Capitalized Costs For Sofware Developed For Internal Use CapitalizedCostsForSofwareDevelopedForInternalUse	2000000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2109000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1080000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	153252000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	135328000	USD
CY2008	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	130267000	USD
CY2010	wat	Schedule Of Intangible Assets By Major Class ScheduleOfIntangibleAssetsByMajorClass	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">T</font><font style="font-family:Times New Roman;font-size:10pt;">he Company's intangible assets included in the consolidated balance sheets are detailed as follows (in thousands):</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 17px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:left;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td colspan="8" style="width: 231px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:231px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">December 31, 2010</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td colspan="8" style="width: 231px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:231px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">December 31, 2009</font></td></tr><tr style="height: 17px"><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Weighted-</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Weighted-</font></td></tr><tr style="height: 17px"><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Gross</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; text-align:center;border-color:#000000;min-width:65px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Average</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Gross</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; text-align:center;border-color:#000000;min-width:65px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Average</font></td></tr><tr style="height: 17px"><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Carrying</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Accumulated</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; text-align:center;border-color:#000000;min-width:65px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Amortization</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Carrying</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Accumulated</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; text-align:center;border-color:#000000;min-width:65px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Amortization</font></td></tr><tr style="height: 17px"><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Amount</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Amortization</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:65px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Period</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Amount</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Amortization</font></td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:65px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 8pt;COLOR: #000000;TEXT-ALIGN: center;">Period</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 132px; text-align:left;border-color:#000000;min-width:132px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Purchased intangibles</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 134,723</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 70,832</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">10</font></td><td style="width: 35px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 136,604</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 61,751</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">10</font></td><td style="width: 35px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 132px; text-align:left;border-color:#000000;min-width:132px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Capitalized software</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 229,850</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 127,056</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">5</font></td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 217,102</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 122,920</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">5</font></td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 132px; text-align:left;border-color:#000000;min-width:132px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Licenses</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 9,877</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 8,971</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">7</font></td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 9,637</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 8,328</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">8</font></td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 132px; text-align:left;border-color:#000000;min-width:132px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Patents and other</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"> </td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"> </td><td style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"> </td></tr><tr style="height: 17px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:left;border-color:#000000;min-width:123px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">intangibles</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 28,931</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 15,206</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">8</font></td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 24,185</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 12,364</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">8</font></td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td></tr><tr style="height: 17px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:left;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"> </td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"> </td><td style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"> </td></tr><tr style="height: 18px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:left;border-color:#000000;min-width:123px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Total</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 65px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 403,381</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 65px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 222,065</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">7</font></td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 65px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 387,528</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">$</font></td><td style="width: 65px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:65px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 205,363</font></td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;">7</font></td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">years</font></td></tr></table></div>
CY2010Q4	wat	Intangible Assets Gross IntangibleAssetsGross	403381000	USD
CY2010Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	222065000	USD
CY2010	us-gaap	Finite Lived Intangible Assets Average Useful Life FiniteLivedIntangibleAssetsAverageUsefulLife	7	pure
CY2009Q4	wat	Intangible Assets Gross IntangibleAssetsGross	387528000	USD
CY2009Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	205363000	USD
CY2009	us-gaap	Finite Lived Intangible Assets Average Useful Life FiniteLivedIntangibleAssetsAverageUsefulLife	7	pure
CY2010	wat	Intangible Assets Gross Foreign Currency Translation Adjustments IntangibleAssetsGrossForeignCurrencyTranslationAdjustments	-17000000	USD
CY2010	wat	Intangible Assets Accumulated Amortization Foreign Currency Translation Adjustments IntangibleAssetsAccumulatedAmortizationForeignCurrencyTranslationAdjustments	-10000000	USD
CY2010	us-gaap	Future Amortization Expense Year One FutureAmortizationExpenseYearOne	27000000	USD
CY2010	us-gaap	Future Amortization Expense Year Three FutureAmortizationExpenseYearThree	35000000	USD
CY2010	us-gaap	Future Amortization Expense Year Four FutureAmortizationExpenseYearFour	35000000	USD
CY2010	us-gaap	Future Amortization Expense Year Five FutureAmortizationExpenseYearFive	35000000	USD
CY2010Q4	us-gaap	Long Term Investments LongTermInvestments	4000000	USD
CY2009Q4	us-gaap	Long Term Investments LongTermInvestments	4000000	USD
CY2008Q4	us-gaap	Goodwill Goodwill	268000000	USD
CY2009	us-gaap	Goodwill Translation And Purchase Accounting Adjustments GoodwillTranslationAndPurchaseAccountingAdjustments	3000000	USD
CY2010	us-gaap	Future Amortization Expense Year Two FutureAmortizationExpenseYearTwo	35000000	USD
CY2009	wat	Intangible Assets Gross Foreign Currency Translation Adjustments IntangibleAssetsGrossForeignCurrencyTranslationAdjustments	4000000	USD
CY2009	wat	Intangible Assets Accumulated Amortization Foreign Currency Translation Adjustments IntangibleAssetsAccumulatedAmortizationForeignCurrencyTranslationAdjustments	3000000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2269000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2442000	USD
CY2008	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1575000	USD
CY2010	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-97312000	USD
CY2009	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-73351000	USD
CY2008	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-82200000	USD
CY2010	wat	Schedule Of Debt ScheduleOfDebt	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">T</font><font style="font-family:Times New Roman;font-size:10pt;">he Company </font><font style="font-family:Times New Roman;font-size:10pt;">had the following outstanding debt </font><font style="font-family:Times New Roman;font-size:10pt;">a</font><font style="font-family:Times New Roman;font-size:10pt;">t </font><font style="font-family:Times New Roman;font-size:10pt;">December 31, 2010</font><font style="font-family:Times New Roman;font-size:10pt;"> and </font><font style="font-family:Times New Roman;font-size:10pt;">2009 </font><font style="font-family:Times New Roman;font-size:10pt;">(in thousands)</font><font style="font-family:Times New Roman;font-size:10pt;">:</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="5" style="width: 246px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:246px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">December 31,</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2010</font></td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">2009</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">Lines of credit</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 11,055</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 11,772</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">2007 Credit Agreement, due January 2012</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 55,000</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 120,000</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">Total notes payable and debt</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 66,055</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 131,772</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Senior unsecured notes - Series A - 3.75%, due February 2015</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 100,000</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> -</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Senior unsecured notes - Series B - 5.00%, due February 2020</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 100,000</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> -</font></td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">2007 Credit Agreement, due January 2012</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 500,000</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 500,000</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;">Total long-term debt</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 700,000</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 500,000</font></td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 18px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: left;">Total debt</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 766,055</font></td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: center;">$</font></td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 10pt;COLOR: #000000;TEXT-ALIGN: right;"> 631,772</font></td></tr></table></div>
CY2010Q4	wat	Total Debt TotalDebt	766055000	USD
CY2009Q4	wat	Total Debt TotalDebt	631772000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	71137000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	59472000	USD
CY2008	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	64837000	USD
CY2010	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	21599000	USD
CY2009	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	24080000	USD
CY2008	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	1687000	USD
CY2010	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	3491000	USD
CY2009	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	3757000	USD
CY2008	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	2422000	USD
CY2010	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	31010000	USD
CY2009	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	35502000	USD
CY2008	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	45604000	USD
CY2008	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	71000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-15037000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3867000	USD
CY2008	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-15124000	USD
CY2010Q4	wat	Net Operating Loss Carryforwards And Credits Deferred Tax Assets NetOperatingLossCarryforwardsAndCreditsDeferredTaxAssets	21359000	USD
CY2009Q4	wat	Net Operating Loss Carryforwards And Credits Deferred Tax Assets NetOperatingLossCarryforwardsAndCreditsDeferredTaxAssets	83515000	USD
CY2010Q4	wat	Depreciation And Capitalized Software Deferred Tax Assets DepreciationAndCapitalizedSoftwareDeferredTaxAssets	10339000	USD
CY2009Q4	wat	Depreciation And Capitalized Software Deferred Tax Assets DepreciationAndCapitalizedSoftwareDeferredTaxAssets	7462000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	24477000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	24858000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	5896000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Equity Method Investments DeferredTaxAssetsEquityMethodInvestments	6159000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	3093000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	2960000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	23976000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	11746000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	8711000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	9316000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	119288000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	163614000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	10361000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	83683000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	108927000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	79931000	USD
CY2010Q4	wat	Depreciation And Capitalized Software Deferred Tax Liabilities DepreciationAndCapitalizedSoftwareDeferredTaxLiabilities	10877000	USD
CY2009Q4	wat	Depreciation And Capitalized Software Deferred Tax Liabilities DepreciationAndCapitalizedSoftwareDeferredTaxLiabilities	9060000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	10308000	USD
CY2009Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	12014000	USD
CY2010Q4	wat	Indefinite Lived Intangibles Deferred Tax Liabilities IndefiniteLivedIntangiblesDeferredTaxLiabilities	19901000	USD
CY2009Q4	wat	Indefinite Lived Intangibles Deferred Tax Liabilities IndefiniteLivedIntangiblesDeferredTaxLiabilities	18764000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	119000	USD
CY2009Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	197000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	41205000	USD
CY2009Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	40035000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	67722000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	39896000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	21437000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	17598000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	48000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	21000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	20000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	19000000	USD
CY2010Q4	wat	Domestic Federal And State Net Operating Loss Carryforward Deferred Tax Assets DomesticFederalAndStateNetOperatingLossCarryforwardDeferredTaxAssets	less than $1 million
CY2009Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	71000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	14000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Research DeferredTaxAssetsTaxCreditCarryforwardsResearch	13000000	USD
CY2010Q4	wat	Foreign Net Operating Loss Deferred Tax Assets Pre Tax ForeignNetOperatingLossDeferredTaxAssetsPreTax	2000000	USD
CY2010Q4	wat	Unrecognized Domestic Federal And State Net Operating Loss Carryforward Deferred Tax Assets UnrecognizedDomesticFederalAndStateNetOperatingLossCarryforwardDeferredTaxAssets	14000000	USD
CY2010Q4	wat	Unrecognized Domestic Federal And State Net Operating Loss Carryforward Deferred Tax Assets Pre Tax UnrecognizedDomesticFederalAndStateNetOperatingLossCarryforwardDeferredTaxAssetsPreTax	38000000	USD
CY2010	wat	Unremitted Earnings Of Foreign Subsidiaries UnremittedEarningsOfForeignSubsidiaries	1700000000	USD
CY2010Q4	wat	Foreign Net Operating Loss Deferred Tax Assets Less Than1 Million ForeignNetOperatingLossDeferredTaxAssetsLessThan1Million	less than $1 million
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	23881000	USD
CY2008	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	1000000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	45000000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	13000000	USD
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	26000000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	154000000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm	4.2	pure
CY2007Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	68463000	USD
CY2008Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	77295000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	77924000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	71523000	USD
CY2010	wat	Increase In Other Uncertain Tax Benefits IncreaseInOtherUncertainTaxBenefits	5095000	USD
CY2009	wat	Increase In Other Uncertain Tax Benefits IncreaseInOtherUncertainTaxBenefits	5184000	USD
CY2008	wat	Increase In Other Uncertain Tax Benefits IncreaseInOtherUncertainTaxBenefits	3832000	USD
CY2010	wat	Percentage Point Change In Effective Tax Rate PercentagePointChangeInEffectiveTaxRate	-2.1	pure
CY2010	wat	Litigation Litigation	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;margin-left:0px;">10</font><font style="font-family:Times New Roman;font-size:10pt;font-weight:bold;">  Litigation</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">The Company is involved in various litigation matters arising in the ordinary course of business. The Company believes the outcome</font><font style="font-family:Times New Roman;font-size:10pt;"> of these matters</font><font style="font-family:Times New Roman;font-size:10pt;"> will not have a material impact on t</font><font style="font-family:Times New Roman;font-size:10pt;">he Company's financial position, results of operations or cash flows.</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">The Company has been engaged in ongoing patent litigation with Agilent Technologies GmbH in </font><font style="font-family:Times New Roman;font-size:10pt;">France</font><font style="font-family:Times New Roman;font-size:10pt;"> and </font><font style="font-family:Times New Roman;font-size:10pt;">Germany</font><font style="font-family:Times New Roman;font-size:10pt;">. In January 2009, the French appeals court affirmed that the Company had infringed the Agilent Technologies GmbH patent and a judgment was issued against the Company. The Company has appealed this judgment. In 2008, the Company recorded a $7 million provision and, in the first quarter of 2009, the Company made a payment of $</font><font style="font-family:Times New Roman;font-size:10pt;">6</font><font style="font-family:Times New Roman;font-size:10pt;"> million for damages and fees estimated to be incurred in connection with the French litigation case. The accrued patent litigation expense is in other current liabilities in the consolidated balance sheets at </font><font style="font-family:Times New Roman;font-size:10pt;">December 31, </font><font style="font-family:Times New Roman;font-size:10pt;">2010</font><font style="font-family:Times New Roman;font-size:10pt;"> and </font><font style="font-family:Times New Roman;font-size:10pt;">2009</font><font style="font-family:Times New Roman;font-size:10pt;">. No provision has been made for the German patent litigation and the Company believes the outcome, if the plaintiff ultimately prevails, will not have a material impact on the Company's financial position.</font></p>
CY2009Q2	us-gaap	Payments For Legal Settlements PaymentsForLegalSettlements	6000000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	18169000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	12033000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	7594000	USD
CY2010Q4	wat	Future Minimum Rents Payable In Five Years And Thereafter FutureMinimumRentsPayableInFiveYearsAndThereafter	13314000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	27000000	USD
CY2009	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	34000000	USD
CY2008	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	30000000	USD
CY2010	wat	License Fees Paid Less Than1 Million LicenseFeesPaidLessThan1Million	less than $1 million
CY2009	wat	License Fees Paid Less Than1 Million LicenseFeesPaidLessThan1Million	less than $1 million
CY2008	wat	License Fees Paid Less Than1 Million LicenseFeesPaidLessThan1Million	less than $1 million
CY2010	wat	Purchase Price Calculation For Shares Of Stock Under Employee Stock Purchase Plan PurchasePriceCalculationForSharesOfStockUnderEmployeeStockPurchasePlan	The purchase price for each share of stock is the lesser of 90% of the market price on the first day of the plan period or 100% of the market price on the last day of the plan period.
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2200000	shares
CY2010Q4	wat	Maximum Contribution Allowed Under Employee Stock Purchase Plan As Of Employees Earnings MaximumContributionAllowedUnderEmployeeStockPurchasePlanAsOfEmployeesEarnings	0.15	pure
CY2010Q4	wat	Total Number Of Shares Authorized For Purchase Under Employee Stock Purchase Plan TotalNumberOfSharesAuthorizedForPurchaseUnderEmployeeStockPurchasePlan	900000	shares
CY2010Q4	wat	Total Number Of Shares Purchased Under Employee Stock Purchase Plan TotalNumberOfSharesPurchasedUnderEmployeeStockPurchasePlan	1000000	shares
CY2009	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	1000000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm	5.6	pure

CY2010

dei

Entity Registrant Name

EntityRegistrantName

WATERS CORP /DE/

CY2010

dei

Entity Central Index Key

EntityCentralIndexKey

0001000697

CY2010

dei

Document Type

DocumentType

10-K

CY2010

dei

Document Fiscal Period Focus

DocumentFiscalPeriodFocus

FY

CY2010

dei

Amendment Flag

AmendmentFlag

false

CY2010

dei

Document Fiscal Year Focus

DocumentFiscalYearFocus

2010

CY2010

dei

Current Fiscal Year End Date

CurrentFiscalYearEndDate

--12-31

CY2010

dei

Entity Well Known Seasoned Issuer

EntityWellKnownSeasonedIssuer

Yes

CY2010

dei

Entity Voluntary Filers

EntityVoluntaryFilers

No

CY2010

dei

Entity Current Reporting Status

EntityCurrentReportingStatus

Yes

CY2010

dei

Entity Filer Category

EntityFilerCategory

Large Accelerated Filer

CY2010Q3

dei

Entity Public Float

EntityPublicFloat

5807530824

USD

CY2010

dei

Document Period End Date

DocumentPeriodEndDate

2010-12-31

CY2011Q1

dei

Entity Common Stock Shares Outstanding

EntityCommonStockSharesOutstanding

91325148

shares

CY2010

wat

Percent Of Net Sales To Pharmaceutical Industry

PercentOfNetSalesToPharmaceuticalIndustry

0.52

pure

CY2009

wat

Percent Of Net Sales To Pharmaceutical Industry

PercentOfNetSalesToPharmaceuticalIndustry

0.51

pure

CY2008

wat

Percent Of Net Sales To Pharmaceutical Industry

PercentOfNetSalesToPharmaceuticalIndustry

0.50

pure

CY2010

wat

Maximum Percentage Of Net Sales To Individual Customer

MaximumPercentageOfNetSalesToIndividualCustomer

0.03

pure

CY2010Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

308498000

USD

CY2010Q4

us-gaap

Accounts Receivable Net Current

AccountsReceivableNetCurrent

358237000

USD

CY2010Q4

us-gaap

Inventory Net

InventoryNet

204300000

USD

CY2010Q4

us-gaap

Other Assets Current

OtherAssetsCurrent

77685000

USD

CY2010Q4

us-gaap

Assets Current

AssetsCurrent

1586641000

USD

CY2010Q4

us-gaap

Property Plant And Equipment Net

PropertyPlantAndEquipmentNet

215060000

USD

CY2010Q4

us-gaap

Intangible Assets Net Excluding Goodwill

IntangibleAssetsNetExcludingGoodwill

181316000

USD

CY2010Q4

us-gaap

Goodwill

291657000

USD

CY2010Q4

us-gaap

Other Assets Noncurrent

OtherAssetsNoncurrent

52996000

USD

CY2010Q4

us-gaap

Assets

2327670000

USD

CY2010Q4

us-gaap

Debt Current

DebtCurrent

66055000

USD

CY2009Q4

us-gaap

Debt Current

DebtCurrent

131772000

USD

CY2010Q4

us-gaap

Accounts Payable Current

AccountsPayableCurrent

64406000

USD

CY2009Q4

us-gaap

Accounts Payable Current

AccountsPayableCurrent

49573000

USD

CY2010Q4

us-gaap

Employee Related Liabilities Current

EmployeeRelatedLiabilitiesCurrent

52831000

USD

CY2009Q4

us-gaap

Employee Related Liabilities Current

EmployeeRelatedLiabilitiesCurrent

37050000

USD

CY2010Q4

us-gaap

Deferred Revenue And Credits Current

DeferredRevenueAndCreditsCurrent

106445000

USD

CY2009Q4

us-gaap

Deferred Revenue And Credits Current

DeferredRevenueAndCreditsCurrent

94680000

USD

CY2010Q4

us-gaap

Accrued Income Taxes Current

AccruedIncomeTaxesCurrent

11909000

USD

CY2009Q4

us-gaap

Accrued Income Taxes Current

AccruedIncomeTaxesCurrent

13267000

USD

CY2010Q4

us-gaap

Standard Product Warranty Accrual

StandardProductWarrantyAccrual

11272000

USD

CY2009Q4

us-gaap

Standard Product Warranty Accrual

StandardProductWarrantyAccrual

10109000

USD

CY2010Q4

us-gaap

Other Liabilities Current

OtherLiabilitiesCurrent

72932000

USD

CY2009Q4

us-gaap

Retained Earnings Accumulated Deficit

RetainedEarningsAccumulatedDeficit

2236716000

USD

CY2010Q4

us-gaap

Treasury Stock Value

TreasuryStockValue

2509466000

USD

CY2009Q4

us-gaap

Other Liabilities Current

OtherLiabilitiesCurrent

58117000

USD

CY2010Q4

us-gaap

Liabilities Current

LiabilitiesCurrent

385850000

USD

CY2009Q4

us-gaap

Liabilities Current

LiabilitiesCurrent

394568000

USD

CY2010Q4

us-gaap

Long Term Debt Noncurrent

LongTermDebtNoncurrent

700000000

USD

CY2009Q4

us-gaap

Long Term Debt Noncurrent

LongTermDebtNoncurrent

500000000

USD

CY2010Q4

us-gaap

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

72624000

USD

CY2009Q4

us-gaap

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

69044000

USD

CY2010Q4

us-gaap

Accrued Income Taxes Noncurrent

AccruedIncomeTaxesNoncurrent

77764000

USD

CY2009Q4

us-gaap

Accrued Income Taxes Noncurrent

AccruedIncomeTaxesNoncurrent

72604000

USD

CY2010Q4

us-gaap

Other Liabilities Noncurrent

OtherLiabilitiesNoncurrent

22635000

USD

CY2009Q4

us-gaap

Other Liabilities Noncurrent

OtherLiabilitiesNoncurrent

22766000

USD

CY2010Q4

us-gaap

Liabilities Noncurrent

LiabilitiesNoncurrent

873023000

USD

CY2009Q4

us-gaap

Liabilities Noncurrent

LiabilitiesNoncurrent

664414000

USD

CY2010Q4

us-gaap

Liabilities

1258873000

USD

CY2009Q4

us-gaap

Liabilities

1058982000

USD

CY2010Q4

us-gaap

Preferred Stock Value

PreferredStockValue

0

USD

CY2009Q4

us-gaap

Preferred Stock Value

PreferredStockValue

0

USD

CY2010Q4

us-gaap

Common Stock Value

CommonStockValue

1511000

USD

CY2009Q4

us-gaap

Common Stock Value

CommonStockValue

1488000

USD

CY2010Q4

us-gaap

Additional Paid In Capital Common Stock

AdditionalPaidInCapitalCommonStock

970068000

USD

CY2009Q4

us-gaap

Additional Paid In Capital Common Stock

AdditionalPaidInCapitalCommonStock

808345000

USD

CY2010Q4

us-gaap

Retained Earnings Accumulated Deficit

RetainedEarningsAccumulatedDeficit

2618479000

USD

CY2009Q4

us-gaap

Treasury Stock Value

TreasuryStockValue

2213174000

USD

CY2010Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

-11795000

USD

CY2009Q4

us-gaap

Accumulated Other Comprehensive Income Loss Net Of Tax

AccumulatedOtherComprehensiveIncomeLossNetOfTax

15574000

USD

CY2010Q4

us-gaap

Stockholders Equity

StockholdersEquity

1068797000

USD

CY2009Q4

us-gaap

Stockholders Equity

StockholdersEquity

848949000

USD

CY2010Q4

us-gaap

Liabilities And Stockholders Equity

LiabilitiesAndStockholdersEquity

2327670000

USD

CY2009Q4

us-gaap

Liabilities And Stockholders Equity

LiabilitiesAndStockholdersEquity

1907931000

USD

CY2009Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

341111000

USD

CY2009Q4

us-gaap

Accounts Receivable Net Current

AccountsReceivableNetCurrent

314247000

USD

CY2009Q4

us-gaap

Inventory Net

InventoryNet

178666000

USD

CY2009Q4

us-gaap

Other Assets Current

OtherAssetsCurrent

49206000

USD

CY2009Q4

us-gaap

Assets Current

AssetsCurrent

1172376000

USD

CY2009Q4

us-gaap

Property Plant And Equipment Net

PropertyPlantAndEquipmentNet

210926000

USD

CY2009Q4

us-gaap

Intangible Assets Net Excluding Goodwill

IntangibleAssetsNetExcludingGoodwill

182165000

USD

CY2009Q4

us-gaap

Goodwill

293077000

USD

CY2009Q4

us-gaap

Other Assets Noncurrent

OtherAssetsNoncurrent

49387000

USD

CY2009Q4

us-gaap

Assets

1907931000

USD

CY2010Q4

wat

Allowances For Doubtful Accounts And Sales Returns

AllowancesForDoubtfulAccountsAndSalesReturns

6196000

USD

CY2010Q4

us-gaap

Preferred Stock Par Or Stated Value Per Share

PreferredStockParOrStatedValuePerShare

0.01

CY2010Q4

us-gaap

Preferred Stock Shares Authorized

PreferredStockSharesAuthorized

5000000

shares

CY2010Q4

us-gaap

Preferred Stock Shares Issued

PreferredStockSharesIssued

0

shares

CY2010Q4

us-gaap

Common Stock Par Or Stated Value Per Share

CommonStockParOrStatedValuePerShare

0.01

CY2010Q4

us-gaap

Common Stock Shares Authorized

CommonStockSharesAuthorized

400000000

shares

CY2010Q4

us-gaap

Common Stock Shares Issued

CommonStockSharesIssued

151054000

shares

CY2010Q4

us-gaap

Common Stock Shares Outstanding

CommonStockSharesOutstanding

91848000

shares

CY2010Q4

us-gaap

Treasury Stock Shares

TreasuryStockShares

59206000

shares

CY2009Q4

wat

Allowances For Doubtful Accounts And Sales Returns

AllowancesForDoubtfulAccountsAndSalesReturns

6723000

USD

CY2009Q4

us-gaap

Preferred Stock Par Or Stated Value Per Share

PreferredStockParOrStatedValuePerShare

0.01

CY2009Q4

us-gaap

Preferred Stock Shares Authorized

PreferredStockSharesAuthorized

5000000

shares

CY2009Q4

us-gaap

Preferred Stock Shares Issued

PreferredStockSharesIssued

0

shares

CY2009Q4

us-gaap

Common Stock Par Or Stated Value Per Share

CommonStockParOrStatedValuePerShare

0.01

CY2009Q4

us-gaap

Common Stock Shares Authorized

CommonStockSharesAuthorized

400000000

shares

CY2009Q4

us-gaap

Common Stock Shares Issued

CommonStockSharesIssued

148831000

shares

CY2009Q4

us-gaap

Common Stock Shares Outstanding

CommonStockSharesOutstanding

94118000

shares

CY2009Q4

us-gaap

Treasury Stock Shares

TreasuryStockShares

54713000

shares

CY2010

us-gaap

Goodwill Translation And Purchase Accounting Adjustments

GoodwillTranslationAndPurchaseAccountingAdjustments

-1000000

USD

CY2010

us-gaap

Commitments And Contingencies2009

CommitmentsAndContingencies2009

CY2009

us-gaap

Commitments And Contingencies2009

CommitmentsAndContingencies2009

CY2010

us-gaap

Sales Revenue Goods Net

SalesRevenueGoodsNet

1166627000

USD

CY2010

us-gaap

Sales Revenue Services Net

SalesRevenueServicesNet

476744000

USD

CY2010

us-gaap

Sales Revenue Net

SalesRevenueNet

1643371000

USD

CY2010

us-gaap

Cost Of Goods Sold

CostOfGoodsSold

453779000

USD

CY2010

us-gaap

Cost Of Services

CostOfServices

199524000

USD

CY2010

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

653303000

USD

CY2010

us-gaap

Gross Profit

GrossProfit

990068000

USD

CY2010

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

445456000

USD

CY2010

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

84274000

USD

CY2010

us-gaap

Operating Income Loss

OperatingIncomeLoss

449932000

USD

CY2010

us-gaap

Interest Expense

InterestExpense

13924000

USD

CY2010

us-gaap

Investment Income Interest

InvestmentIncomeInterest

1855000

USD

CY2010

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

437863000

USD

CY2010

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

56100000

USD

CY2010

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

381763000

USD

CY2010

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

4.13

CY2010

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

92385000

shares

CY2010

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

4.06

CY2010

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

94057000

shares

CY2009

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

96862000

shares

CY2009

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

3.34

CY2009

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

95797000

shares

CY2009

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

3.37

CY2009

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

323313000

USD

CY2009

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

63339000

USD

CY2009

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

386652000

USD

CY2009

us-gaap

Investment Income Interest

InvestmentIncomeInterest

3036000

USD

CY2009

us-gaap

Interest Expense

InterestExpense

10986000

USD

CY2009

us-gaap

Operating Income Loss

OperatingIncomeLoss

394602000

USD

CY2009

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

77154000

USD

CY2009

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

421403000

USD

CY2009

us-gaap

Gross Profit

GrossProfit

903818000

USD

CY2009

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

594882000

USD

CY2009

us-gaap

Cost Of Services

CostOfServices

188201000

USD

CY2009

us-gaap

Cost Of Goods Sold

CostOfGoodsSold

406681000

USD

CY2009

us-gaap

Sales Revenue Net

SalesRevenueNet

1498700000

USD

CY2010

us-gaap

Payments For Proceeds From Hedge Financing Activities

PaymentsForProceedsFromHedgeFinancingActivities

8138000

USD

CY2010

us-gaap

Net Cash Provided By Used In Financing Activities

NetCashProvidedByUsedInFinancingActivities

-60252000

USD

CY2010

us-gaap

Effect Of Exchange Rate On Cash And Cash Equivalents

EffectOfExchangeRateOnCashAndCashEquivalents

-18702000

USD

CY2010

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-32613000

USD

CY2009

us-gaap

Sales Revenue Services Net

SalesRevenueServicesNet

446722000

USD

CY2009

us-gaap

Sales Revenue Goods Net

SalesRevenueGoodsNet

1051978000

USD

CY2009

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

10659000

USD

CY2010

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

10406000

USD

CY2008

us-gaap

Sales Revenue Goods Net

SalesRevenueGoodsNet

1139886000

USD

CY2008

us-gaap

Sales Revenue Services Net

SalesRevenueServicesNet

435238000

USD

CY2008

us-gaap

Sales Revenue Net

SalesRevenueNet

1575124000

USD

CY2008

us-gaap

Cost Of Goods Sold

CostOfGoodsSold

457886000

USD

CY2008

us-gaap

Cost Of Services

CostOfServices

203380000

USD

CY2008

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

661266000

USD

CY2008

us-gaap

Gross Profit

GrossProfit

913858000

USD

CY2008

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

426699000

USD

CY2008

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

81588000

USD

CY2008

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

9290000

USD

CY2008

us-gaap

Operating Income Loss

OperatingIncomeLoss

389754000

USD

CY2008

us-gaap

Interest Expense

InterestExpense

38521000

USD

CY2008

us-gaap

Investment Income Interest

InvestmentIncomeInterest

20959000

USD

CY2008

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

372192000

USD

CY2008

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

49713000

USD

CY2008

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

322479000

USD

CY2008

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

3.25

CY2008

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

99199000

shares

CY2008

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

3.21

CY2008

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

100555000

shares

CY2008

us-gaap

Gain Loss Related To Litigation Settlement

GainLossRelatedToLitigationSettlement

-6527000

USD

CY2010

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

0.128

pure

CY2009

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

0.164

pure

CY2008

us-gaap

Effective Income Tax Rate Continuing Operations

EffectiveIncomeTaxRateContinuingOperations

0.134

pure

CY2010

us-gaap

Provision For Doubtful Accounts

ProvisionForDoubtfulAccounts

2926000

USD

CY2010

us-gaap

Inventory Write Down

InventoryWriteDown

10897000

USD

CY2010

us-gaap

Share Based Compensation

ShareBasedCompensation

24852000

USD

CY2010

us-gaap

Depreciation

34421000

USD

CY2010

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

28137000

USD

CY2010

us-gaap

Increase Decrease In Accounts Receivable

IncreaseDecreaseInAccountsReceivable

43286000

USD

CY2010

us-gaap

Increase Decrease In Inventories

IncreaseDecreaseInInventories

37036000

USD

CY2010

us-gaap

Increase Decrease In Prepaid Deferred Expense And Other Assets

IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

-2402000

USD

CY2010

us-gaap

Increase Decrease In Other Operating Assets

IncreaseDecreaseInOtherOperatingAssets

-2472000

USD

CY2010

us-gaap

Increase Decrease In Accounts Payable And Accrued Liabilities

IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

52017000

USD

CY2010

us-gaap

Increase Decrease In Other Operating Liabilities

IncreaseDecreaseInOtherOperatingLiabilities

3895000

USD

CY2010

us-gaap

Net Cash Provided By Used In Operating Activities

NetCashProvidedByUsedInOperatingActivities

457856000

USD

CY2010

us-gaap

Payments For Proceeds From Productive Assets

PaymentsForProceedsFromProductiveAssets

62740000

USD

CY2010

us-gaap

Payments To Acquire Short Term Investments

PaymentsToAcquireShortTermInvestments

1234671000

USD

CY2010

us-gaap

Proceeds From Sale Of Short Term Investments

ProceedsFromSaleOfShortTermInvestments

885896000

USD

CY2010

us-gaap

Net Cash Provided By Used In Investing Activities

NetCashProvidedByUsedInInvestingActivities

-411515000

USD

CY2010

us-gaap

Proceeds From Issuance Of Long Term Debt

ProceedsFromIssuanceOfLongTermDebt

315641000

USD

CY2010

us-gaap

Repayments Of Long Term Debt

RepaymentsOfLongTermDebt

181358000

USD

CY2010

us-gaap

Payments Of Debt Issuance Costs

PaymentsOfDebtIssuanceCosts

1498000

USD

CY2010

us-gaap

Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options

ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

100584000

USD

CY2010

us-gaap

Payments For Repurchase Of Common Stock

PaymentsForRepurchaseOfCommonStock

296292000

USD

CY2010

us-gaap

Excess Tax Benefit From Share Based Compensation Financing Activities

ExcessTaxBenefitFromShareBasedCompensationFinancingActivities

10809000

USD

CY2009

us-gaap

Payments For Proceeds From Hedge Financing Activities

PaymentsForProceedsFromHedgeFinancingActivities

-5162000

USD

CY2009

us-gaap

Net Cash Provided By Used In Financing Activities

NetCashProvidedByUsedInFinancingActivities

-90280000

USD

CY2009

us-gaap

Effect Of Exchange Rate On Cash And Cash Equivalents

EffectOfExchangeRateOnCashAndCashEquivalents

3634000

USD

CY2009

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-87411000

USD

CY2009

us-gaap

Proceeds From Issuance Of Long Term Debt

ProceedsFromIssuanceOfLongTermDebt

184309000

USD

CY2009

us-gaap

Repayments Of Long Term Debt

RepaymentsOfLongTermDebt

92556000

USD

CY2009

us-gaap

Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options

ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

19099000

USD

CY2009

us-gaap

Payments For Repurchase Of Common Stock

PaymentsForRepurchaseOfCommonStock

211377000

USD

CY2009

us-gaap

Net Cash Provided By Used In Investing Activities

NetCashProvidedByUsedInInvestingActivities

-419028000

USD

CY2009

us-gaap

Payments To Acquire Short Term Investments

PaymentsToAcquireShortTermInvestments

518390000

USD

CY2009

us-gaap

Payments For Proceeds From Productive Assets

PaymentsForProceedsFromProductiveAssets

93796000

USD

CY2009

us-gaap

Payments To Acquire Businesses Net Of Cash Acquired

PaymentsToAcquireBusinessesNetOfCashAcquired

36086000

USD

CY2009

us-gaap

Increase Decrease In Accounts Payable And Accrued Liabilities

IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

-10830000

USD

CY2009

us-gaap

Increase Decrease In Other Operating Liabilities

IncreaseDecreaseInOtherOperatingLiabilities

-13220000

USD

CY2009

us-gaap

Net Cash Provided By Used In Operating Activities

NetCashProvidedByUsedInOperatingActivities

418263000

USD

CY2009

us-gaap

Increase Decrease In Accounts Receivable

IncreaseDecreaseInAccountsReceivable

16905000

USD

CY2009

us-gaap

Increase Decrease In Inventories

IncreaseDecreaseInInventories

6823000

USD

CY2009

us-gaap

Increase Decrease In Prepaid Deferred Expense And Other Assets

IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

-5925000

USD

CY2009

us-gaap

Increase Decrease In Other Operating Assets

IncreaseDecreaseInOtherOperatingAssets

689000

USD

CY2009

us-gaap

Provision For Doubtful Accounts

ProvisionForDoubtfulAccounts

3124000

USD

CY2009

us-gaap

Inventory Write Down

InventoryWriteDown

9952000

USD

CY2009

us-gaap

Share Based Compensation

ShareBasedCompensation

28255000

USD

CY2009

us-gaap

Depreciation

31805000

USD

CY2009

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

25467000

USD

CY2008Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

428522000

USD

CY2010

wat

Increase In Deferred Revenue And Customer Advances

IncreaseInDeferredRevenueAndCustomerAdvances

9433000

USD

CY2009

wat

Increase In Deferred Revenue And Customer Advances

IncreaseInDeferredRevenueAndCustomerAdvances

2613000

USD

CY2010

us-gaap

Payments To Acquire Businesses Net Of Cash Acquired

PaymentsToAcquireBusinessesNetOfCashAcquired

0

USD

CY2009

us-gaap

Proceeds From Sale Of Short Term Investments

ProceedsFromSaleOfShortTermInvestments

229244000

USD

CY2009

us-gaap

Payments Of Debt Issuance Costs

PaymentsOfDebtIssuanceCosts

0

USD

CY2009

us-gaap

Excess Tax Benefit From Share Based Compensation Financing Activities

ExcessTaxBenefitFromShareBasedCompensationFinancingActivities

5083000

USD

CY2008

us-gaap

Provision For Doubtful Accounts

ProvisionForDoubtfulAccounts

3924000

USD

CY2008

us-gaap

Inventory Write Down

InventoryWriteDown

10632000

USD

CY2008

us-gaap

Share Based Compensation

ShareBasedCompensation

30782000

USD

CY2008

us-gaap

Depreciation

29071000

USD

CY2008

us-gaap

Amortization Of Intangible Assets

AmortizationOfIntangibleAssets

36200000

USD

CY2008

us-gaap

Increase Decrease In Accounts Receivable

IncreaseDecreaseInAccountsReceivable

-21739000

USD

CY2008

us-gaap

Increase Decrease In Inventories

IncreaseDecreaseInInventories

20618000

USD

CY2008

us-gaap

Increase Decrease In Prepaid Deferred Expense And Other Assets

IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

4633000

USD

CY2008

us-gaap

Increase Decrease In Other Operating Assets

IncreaseDecreaseInOtherOperatingAssets

-5180000

USD

CY2008

us-gaap

Increase Decrease In Accounts Payable And Accrued Liabilities

IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

-19970000

USD

CY2008

wat

Increase In Deferred Revenue And Customer Advances

IncreaseInDeferredRevenueAndCustomerAdvances

1976000

USD

CY2008

us-gaap

Increase Decrease In Other Operating Liabilities

IncreaseDecreaseInOtherOperatingLiabilities

21112000

USD

CY2008

us-gaap

Net Cash Provided By Used In Operating Activities

NetCashProvidedByUsedInOperatingActivities

418248000

USD

CY2008

us-gaap

Payments For Proceeds From Productive Assets

PaymentsForProceedsFromProductiveAssets

69065000

USD

CY2008

us-gaap

Payments To Acquire Businesses Net Of Cash Acquired

PaymentsToAcquireBusinessesNetOfCashAcquired

7805000

USD

CY2008

us-gaap

Payments To Acquire Short Term Investments

PaymentsToAcquireShortTermInvestments

19738000

USD

CY2008

us-gaap

Proceeds From Sale Of Short Term Investments

ProceedsFromSaleOfShortTermInvestments

115419000

USD

CY2008

us-gaap

Net Cash Provided By Used In Investing Activities

NetCashProvidedByUsedInInvestingActivities

18811000

USD

CY2008

us-gaap

Proceeds From Issuance Of Long Term Debt

ProceedsFromIssuanceOfLongTermDebt

469407000

USD

CY2008

us-gaap

Repayments Of Long Term Debt

RepaymentsOfLongTermDebt

817463000

USD

CY2008

us-gaap

Payments Of Debt Issuance Costs

PaymentsOfDebtIssuanceCosts

501000

USD

CY2008

us-gaap

Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options

ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions

28646000

USD

CY2008

us-gaap

Payments For Repurchase Of Common Stock

PaymentsForRepurchaseOfCommonStock

237500000

USD

CY2008

us-gaap

Excess Tax Benefit From Share Based Compensation Financing Activities

ExcessTaxBenefitFromShareBasedCompensationFinancingActivities

6669000

USD

CY2008

us-gaap

Payments For Proceeds From Hedge Financing Activities

PaymentsForProceedsFromHedgeFinancingActivities

22196000

USD

CY2008

us-gaap

Net Cash Provided By Used In Financing Activities

NetCashProvidedByUsedInFinancingActivities

-572938000

USD

CY2008

us-gaap

Effect Of Exchange Rate On Cash And Cash Equivalents

EffectOfExchangeRateOnCashAndCashEquivalents

-32932000

USD

CY2008

us-gaap

Cash And Cash Equivalents Period Increase Decrease

CashAndCashEquivalentsPeriodIncreaseDecrease

-168811000

USD

CY2010

us-gaap

Income Taxes Paid Net

IncomeTaxesPaidNet

39688000

USD

CY2010

us-gaap

Interest Paid Net

InterestPaidNet

10564000

USD

CY2009

us-gaap

Income Taxes Paid Net

IncomeTaxesPaidNet

23818000

USD

CY2009

us-gaap

Interest Paid Net

InterestPaidNet

13020000

USD

CY2008

us-gaap

Income Taxes Paid Net

IncomeTaxesPaidNet

40571000

USD

CY2008

us-gaap

Interest Paid Net

InterestPaidNet

44081000

USD

CY2007Q4

us-gaap

Cash And Cash Equivalents At Carrying Value

CashAndCashEquivalentsAtCarryingValue

597333000

USD

CY2010

us-gaap

Deferred Income Taxes And Tax Credits

DeferredIncomeTaxesAndTaxCredits

-15037000

USD

CY2009

us-gaap

Deferred Income Taxes And Tax Credits

DeferredIncomeTaxesAndTaxCredits

36276000

USD

CY2008

us-gaap

Deferred Income Taxes And Tax Credits

DeferredIncomeTaxesAndTaxCredits

-19626000

USD

CY2007Q4

us-gaap

Stockholders Equity

StockholdersEquity

586076000

USD

CY2008Q4

us-gaap

Stockholders Equity

StockholdersEquity

661005000

USD

CY2007Q4

us-gaap

Shares Issued

SharesIssued

147061000

shares

CY2010Q4

us-gaap

Shares Issued

SharesIssued

151054000

shares

CY2008Q4

us-gaap

Shares Issued

SharesIssued

148069000

shares

CY2009Q4

us-gaap

Shares Issued

SharesIssued

148831000

shares

CY2010

us-gaap

Stock Issued During Period Shares Employee Stock Purchase Plans

StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

62000

shares

CY2010

us-gaap

Stock Issued During Period Shares Share Based Compensation

StockIssuedDuringPeriodSharesShareBasedCompensation

228000

shares

CY2009

us-gaap

Stock Issued During Period Shares Employee Stock Purchase Plans

StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

88000

shares

CY2009

us-gaap

Stock Issued During Period Shares Share Based Compensation

StockIssuedDuringPeriodSharesShareBasedCompensation

160000

shares

CY2009

us-gaap

Stock Issued During Period Shares Stock Options Exercised

StockIssuedDuringPeriodSharesStockOptionsExercised

514000

shares

CY2010

us-gaap

Stock Issued During Period Shares Stock Options Exercised

StockIssuedDuringPeriodSharesStockOptionsExercised

1933000

shares

CY2008

us-gaap

Stock Issued During Period Shares Employee Stock Purchase Plans

StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

61000

shares

CY2008

us-gaap

Stock Issued During Period Shares Stock Options Exercised

StockIssuedDuringPeriodSharesStockOptionsExercised

825000

shares

CY2008

us-gaap

Stock Issued During Period Shares Share Based Compensation

StockIssuedDuringPeriodSharesShareBasedCompensation

122000

shares

CY2008

us-gaap

Stock Issued During Period Value Employee Stock Purchase Plan

StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

3410000

USD

CY2009

us-gaap

Stock Issued During Period Value Employee Stock Purchase Plan

StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

3244000

USD

CY2010

us-gaap

Stock Issued During Period Value Employee Stock Purchase Plan

StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

3458000

USD

CY2008

us-gaap

Stock Issued During Period Value Stock Options Exercised

StockIssuedDuringPeriodValueStockOptionsExercised

25236000

USD

CY2009

us-gaap

Stock Issued During Period Value Stock Options Exercised

StockIssuedDuringPeriodValueStockOptionsExercised

15855000

USD

CY2010

us-gaap

Stock Issued During Period Value Stock Options Exercised

StockIssuedDuringPeriodValueStockOptionsExercised

97126000

USD

CY2008

us-gaap

Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation

AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation

6669000

USD

CY2009

us-gaap

Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation

AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation

5083000

USD

CY2010

us-gaap

Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation

AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation

10809000

USD

CY2008

wat

Adjustments To Additional Paid In Capital Increase In Valuation Allowance

AdjustmentsToAdditionalPaidInCapitalIncreaseInValuationAllowance

1732000

USD

CY2009

wat

Adjustments To Additional Paid In Capital Increase In Valuation Allowance

AdjustmentsToAdditionalPaidInCapitalIncreaseInValuationAllowance

705000

USD

CY2010

wat

Adjustments To Additional Paid In Capital Increase In Valuation Allowance

AdjustmentsToAdditionalPaidInCapitalIncreaseInValuationAllowance

-25873000

USD

CY2008

us-gaap

Stock Issued During Period Value Share Based Compensation

StockIssuedDuringPeriodValueShareBasedCompensation

31180000

USD

CY2009

us-gaap

Stock Issued During Period Value Share Based Compensation

StockIssuedDuringPeriodValueShareBasedCompensation

28376000

USD

CY2010

us-gaap

Stock Issued During Period Value Share Based Compensation

StockIssuedDuringPeriodValueShareBasedCompensation

24480000

USD

CY2008

us-gaap

Treasury Stock Value Acquired Cost Method

TreasuryStockValueAcquiredCostMethod

237500000

USD

CY2009

us-gaap

Treasury Stock Value Acquired Cost Method

TreasuryStockValueAcquiredCostMethod

211377000

USD

CY2010

us-gaap

Treasury Stock Value Acquired Cost Method

TreasuryStockValueAcquiredCostMethod

296292000

USD

CY2010

us-gaap

Nature Of Operations

NatureOfOperations

Waters Corporation (“Waters®” or the “Company”), an analytical instrument manufacturer, primarily designs, manufactures, sells and services, through its Waters Division, high performance liquid chromatography (“HPLC”), ultra performance liquid chromatography (“UPLC®” and together with HPLC, referred to as “LC”) and mass spectrometry (“MS”) instrument systems and support products, including chromatography columns, other consumable products and comprehensive post-warranty service plans. These systems are complementary products that can be integrated together and used along with other analytical instruments. LC is a standard technique and is utilized in a broad range of industries to detect, identify, monitor and measure the chemical, physical and biological composition of materials, and to purify a full range of compounds. MS instruments are used in drug discovery and development, including clinical trial testing, the analysis of proteins in disease processes (known as “proteomics”), food safety analysis and environmental testing. LC is often combined with MS to create LC-MS instruments that include a liquid phase sample introduction and separation system with mass spectrometric compound identification and quantification. Through its TA Division (“TA®”), the Company primarily designs, manufactures, sells and services thermal analysis, rheometry and calorimetry instruments, which are used in predicting the suitability of fine chemicals, polymers and viscous liquids for various industrial, consumer goods and healthcare products, as well as for life science research. The Company is also a developer and supplier of software-based products that interface with the Company's instruments and are typically purchased by customers as part of the instrument system.

CY2010Q4

us-gaap

Cash Equivalents At Carrying Value

CashEquivalentsAtCarryingValue

87975000

USD

CY2007Q4

wat

Allowances For Doubtful Accounts And Sales Returns

AllowancesForDoubtfulAccountsAndSalesReturns

9634000

USD

CY2010

wat

Additions To Allowance For Doubtful Accounts And Sales Returns

AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns

5508000

USD

CY2010

wat

Deductions From Allowance For Doubtful Accounts And Sales Returns

DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns

-6035000

USD

CY2008Q4

wat

Allowances For Doubtful Accounts And Sales Returns

AllowancesForDoubtfulAccountsAndSalesReturns

7608000

USD

CY2009

wat

Additions To Allowance For Doubtful Accounts And Sales Returns

AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns

6956000

USD

CY2009

wat

Deductions From Allowance For Doubtful Accounts And Sales Returns

DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns

-7841000

USD

CY2008

wat

Additions To Allowance For Doubtful Accounts And Sales Returns

AdditionsToAllowanceForDoubtfulAccountsAndSalesReturns

5470000

USD

CY2008

wat

Deductions From Allowance For Doubtful Accounts And Sales Returns

DeductionsFromAllowanceForDoubtfulAccountsAndSalesReturns

-7496000

USD

CY2009Q4

us-gaap

Interest Rate Cash Flow Hedge Liability At Fair Value

InterestRateCashFlowHedgeLiabilityAtFairValue

0

USD

CY2009

wat

Cumulative Pre Tax Unrealized Gain Loss On Interest Rate Swap Agreements Recorded In Accumulated Other Comprehensive Income

CumulativePreTaxUnrealizedGainLossOnInterestRateSwapAgreementsRecordedInAccumulatedOtherComprehensiveIncome

2000000

USD

CY2008

wat

Cumulative Pre Tax Unrealized Gain Loss On Interest Rate Swap Agreements Recorded In Accumulated Other Comprehensive Income

CumulativePreTaxUnrealizedGainLossOnInterestRateSwapAgreementsRecordedInAccumulatedOtherComprehensiveIncome

-1000000

USD

CY2010Q4

us-gaap

Short Term Investments

ShortTermInvestments

637921000

USD

CY2010Q4

us-gaap

Foreign Currency Fair Value Hedge Asset At Fair Value

ForeignCurrencyFairValueHedgeAssetAtFairValue

424000

USD

CY2010Q4

wat

Fair Value Total Assets Measured On Recurring Basis

FairValueTotalAssetsMeasuredOnRecurringBasis

746308000

USD

CY2010Q4

us-gaap

Foreign Currency Fair Value Hedge Liability At Fair Value

ForeignCurrencyFairValueHedgeLiabilityAtFairValue

626000

USD

CY2010Q4

wat

Fair Value Total Liabilities Measured On Recurring Basis

FairValueTotalLiabilitiesMeasuredOnRecurringBasis

626000

USD

CY2010Q4

wat

Waters Restoration Plan Assets

WatersRestorationPlanAssets

19988000

USD

CY2009Q4

us-gaap

Cash Equivalents At Carrying Value

CashEquivalentsAtCarryingValue

181925000

USD

CY2009Q4

us-gaap

Short Term Investments

ShortTermInvestments

289146000

USD

CY2009Q4

us-gaap

Foreign Currency Fair Value Hedge Asset At Fair Value

ForeignCurrencyFairValueHedgeAssetAtFairValue

237000

USD

CY2009Q4

wat

Fair Value Total Assets Measured On Recurring Basis

FairValueTotalAssetsMeasuredOnRecurringBasis

489263000

USD

CY2009Q4

us-gaap

Foreign Currency Fair Value Hedge Liability At Fair Value

ForeignCurrencyFairValueHedgeLiabilityAtFairValue

400000

USD

CY2009Q4

wat

Fair Value Total Liabilities Measured On Recurring Basis

FairValueTotalLiabilitiesMeasuredOnRecurringBasis

400000

USD

CY2009Q4

wat

Waters Restoration Plan Assets

WatersRestorationPlanAssets

17955000

USD

CY2007Q3

wat

Contract Notional Amount Of Interest Rate Swap Agreements

ContractNotionalAmountOfInterestRateSwapAgreements

50000000

USD

CY2010Q4

us-gaap

Interest Rate Cash Flow Hedge Liability At Fair Value

InterestRateCashFlowHedgeLiabilityAtFairValue

0

USD

CY2009

wat

Additional Interest Expense Recorded From Interest Rate Swap Agreements

AdditionalInterestExpenseRecordedFromInterestRateSwapAgreements

2000000

USD

CY2008

wat

Additional Interest Expense Recorded From Interest Rate Swap Agreements

AdditionalInterestExpenseRecordedFromInterestRateSwapAgreements

1000000

USD

CY2010Q4

us-gaap

Notional Amount Of Foreign Currency Fair Value Hedge Derivatives

NotionalAmountOfForeignCurrencyFairValueHedgeDerivatives

136000000

USD

CY2009Q4

us-gaap

Notional Amount Of Foreign Currency Fair Value Hedge Derivatives

NotionalAmountOfForeignCurrencyFairValueHedgeDerivatives

138000000

USD

CY2010

wat

Cumulative Net Pre Tax Gains Losses On Forward Foreign Exchange Contracts

CumulativeNetPreTaxGainsLossesOnForwardForeignExchangeContracts

-8000000

USD

CY2010

us-gaap

Gain Loss On Foreign Currency Fair Value Hedge Derivatives

GainLossOnForeignCurrencyFairValueHedgeDerivatives

-8000000

USD

CY2010

us-gaap

Change In Unrealized Gain Loss On Foreign Currency Fair Value Hedging Instruments

ChangeInUnrealizedGainLossOnForeignCurrencyFairValueHedgingInstruments

0

USD

CY2009

wat

Cumulative Net Pre Tax Gains Losses On Forward Foreign Exchange Contracts

CumulativeNetPreTaxGainsLossesOnForwardForeignExchangeContracts

7000000

USD

CY2009

us-gaap

Gain Loss On Foreign Currency Fair Value Hedge Derivatives

GainLossOnForeignCurrencyFairValueHedgeDerivatives

5000000

USD

CY2009

us-gaap

Change In Unrealized Gain Loss On Foreign Currency Fair Value Hedging Instruments

ChangeInUnrealizedGainLossOnForeignCurrencyFairValueHedgingInstruments

2000000

USD

CY2008

wat

Cumulative Net Pre Tax Gains Losses On Forward Foreign Exchange Contracts

CumulativeNetPreTaxGainsLossesOnForwardForeignExchangeContracts

-23000000

USD

CY2008

us-gaap

Gain Loss On Foreign Currency Fair Value Hedge Derivatives

GainLossOnForeignCurrencyFairValueHedgeDerivatives

-22000000

USD

CY2008

us-gaap

Change In Unrealized Gain Loss On Foreign Currency Fair Value Hedging Instruments

ChangeInUnrealizedGainLossOnForeignCurrencyFairValueHedgingInstruments

-1000000

USD

CY2008Q4

us-gaap

Notional Amount Of Foreign Currency Fair Value Hedge Derivatives

NotionalAmountOfForeignCurrencyFairValueHedgeDerivatives

120000000

USD

CY2010Q4

us-gaap

Class Of Warrant Or Right Exercise Price Of Warrants Or Rights

ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights

120.00

CY2010Q4

wat

Preferred Share Purchase Rights Triggering Event

PreferredSharePurchaseRightsTriggeringEvent

When a person or group actually has acquired 15% or more of Waters’ common stock, the Rights will then become exercisable for a number of shares of Waters’ common stock with a market value of twice the $120.00 exercise price of each Right.

CY2010Q4

wat

Preferred Share Purchase Rights Redemption Provision

PreferredSharePurchaseRightsRedemptionProvision

The Board of Directors may redeem the Rights at a price of $0.001 per Right up until 10 days following a public announcement that any person or group has acquired 15% or more of the Company’s common stock.

CY2010Q4

wat

Preferred Share Purchase Rights Number Of Securities Called

PreferredSharePurchaseRightsNumberOfSecuritiesCalled

When they first become exercisable, each Right will entitle its holder to buy from Waters one one-hundredth of a share of new Series A Junior Participating Preferred Stock (authorized limit of 4,000) for $120.00.

CY2010

us-gaap

Standard Product Warranty Accrual Warranties Issued

StandardProductWarrantyAccrualWarrantiesIssued

7618000

USD

CY2010

us-gaap

Standard Product Warranty Accrual Payments

StandardProductWarrantyAccrualPayments

-6455000

USD

CY2009

us-gaap

Standard Product Warranty Accrual Warranties Issued

StandardProductWarrantyAccrualWarrantiesIssued

5725000

USD

CY2009

us-gaap

Standard Product Warranty Accrual Payments

StandardProductWarrantyAccrualPayments

-5892000

USD

CY2008Q4

us-gaap

Standard Product Warranty Accrual

StandardProductWarrantyAccrual

10276000

USD

CY2007Q4

us-gaap

Standard Product Warranty Accrual

StandardProductWarrantyAccrual

13119000

USD

CY2008

us-gaap

Standard Product Warranty Accrual Warranties Issued

StandardProductWarrantyAccrualWarrantiesIssued

9644000

USD

CY2008

us-gaap

Standard Product Warranty Accrual Payments

StandardProductWarrantyAccrualPayments

-12487000

USD

CY2010

us-gaap

Advertising Expense

AdvertisingExpense

10000000

USD

CY2009

us-gaap

Advertising Expense

AdvertisingExpense

10000000

USD

CY2008

us-gaap

Advertising Expense

AdvertisingExpense

9000000

USD

CY2010Q4

us-gaap

Property Plant And Equipment Gross

PropertyPlantAndEquipmentGross

466425000

USD

CY2009Q4

us-gaap

Property Plant And Equipment Gross

PropertyPlantAndEquipmentGross

437891000

USD

CY2009Q4

us-gaap

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

226965000

USD

CY2010Q4

us-gaap

Inventory Work In Process Net Of Reserves

InventoryWorkInProcessNetOfReserves

17301000

USD

CY2010Q4

us-gaap

Inventory Finished Goods Net Of Reserves

InventoryFinishedGoodsNetOfReserves

123524000

USD

CY2010

us-gaap

Property Plant And Equipment Disposals

PropertyPlantAndEquipmentDisposals

9000000

USD

us-gaap

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

0.35

pure

wat

Irish Tax Rate

IrishTaxRate

0.10

pure

CY2010Q4

us-gaap

Inventory Raw Materials Net Of Reserves

InventoryRawMaterialsNetOfReserves

63475000

USD

CY2009Q4

us-gaap

Inventory Raw Materials Net Of Reserves

InventoryRawMaterialsNetOfReserves

57223000

USD

CY2009Q4

us-gaap

Inventory Work In Process Net Of Reserves

InventoryWorkInProcessNetOfReserves

15419000

USD

CY2009Q4

us-gaap

Inventory Finished Goods Net Of Reserves

InventoryFinishedGoodsNetOfReserves

106024000

USD

CY2010Q4

us-gaap

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

251365000

USD

CY2009

us-gaap

Property Plant And Equipment Disposals

PropertyPlantAndEquipmentDisposals

7000000

USD

CY2008

us-gaap

Property Plant And Equipment Disposals

PropertyPlantAndEquipmentDisposals

9000000

USD

CY2010Q4

wat

Capitalized Costs For Sofware Developed For Internal Use

CapitalizedCostsForSofwareDevelopedForInternalUse

4000000

USD

CY2009Q4

wat

Capitalized Costs For Sofware Developed For Internal Use

CapitalizedCostsForSofwareDevelopedForInternalUse

2000000

USD

CY2010

us-gaap

Income Tax Reconciliation Other Adjustments

IncomeTaxReconciliationOtherAdjustments

-2109000

USD

CY2009

us-gaap

Income Tax Reconciliation Other Adjustments

IncomeTaxReconciliationOtherAdjustments

-1080000

USD

CY2010

us-gaap

Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate

IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

153252000

USD

CY2009

us-gaap

Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate

IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

135328000

USD

CY2008

us-gaap

Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate

IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate

130267000

USD

CY2010

wat

Schedule Of Intangible Assets By Major Class

ScheduleOfIntangibleAssetsByMajorClass

The Company's intangible assets included in the consolidated balance sheets are detailed as follows (in thousands):<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 17px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:left;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td colspan="8" style="width: 231px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:231px;">December 31, 2010</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td colspan="8" style="width: 231px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:231px;">December 31, 2009</td></tr><tr style="height: 17px"><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;">Weighted-</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:65px;">Weighted-</td></tr><tr style="height: 17px"><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;">Gross</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; text-align:center;border-color:#000000;min-width:65px;">Average</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;">Gross</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:center;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; text-align:center;border-color:#000000;min-width:65px;">Average</td></tr><tr style="height: 17px"><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;">Carrying</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;">Accumulated</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; text-align:center;border-color:#000000;min-width:65px;">Amortization</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;">Carrying</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; text-align:center;border-color:#000000;min-width:74px;">Accumulated</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; text-align:center;border-color:#000000;min-width:65px;">Amortization</td></tr><tr style="height: 17px"><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:center;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;">Amount</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;">Amortization</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:65px;">Period</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;">Amount</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 74px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;">Amortization</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:65px;">Period</td></tr><tr style="height: 17px"><td colspan="2" style="width: 132px; text-align:left;border-color:#000000;min-width:132px;">Purchased intangibles</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;">$</td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> 134,723</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;">$</td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> 70,832</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:30px;">10</td><td style="width: 35px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:35px;">years</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;">$</td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> 136,604</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;">$</td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> 61,751</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:30px;">10</td><td style="width: 35px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:35px;">years</td></tr><tr style="height: 17px"><td colspan="2" style="width: 132px; text-align:left;border-color:#000000;min-width:132px;">Capitalized software</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> 229,850</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> 127,056</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;">5</td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;">years</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> 217,102</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> 122,920</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;">5</td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;">years</td></tr><tr style="height: 17px"><td colspan="2" style="width: 132px; text-align:left;border-color:#000000;min-width:132px;">Licenses</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> 9,877</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> 8,971</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;">7</td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;">years</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> 9,637</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> 8,328</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;">8</td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;">years</td></tr><tr style="height: 17px"><td colspan="2" style="width: 132px; text-align:left;border-color:#000000;min-width:132px;">Patents and other</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"> </td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"> </td><td style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"> </td></tr><tr style="height: 17px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:left;border-color:#000000;min-width:123px;">intangibles</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:65px;"> 28,931</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:65px;"> 15,206</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;">8</td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;">years</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:65px;"> 24,185</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:65px;"> 12,364</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;">8</td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;">years</td></tr><tr style="height: 17px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:left;border-color:#000000;min-width:123px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"> </td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 65px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:65px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;"> </td><td style="width: 35px; text-align:left;border-color:#000000;min-width:35px;"> </td></tr><tr style="height: 18px"><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 123px; text-align:left;border-color:#000000;min-width:123px;">Total</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:9px;">$</td><td style="width: 65px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:65px;"> 403,381</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:9px;">$</td><td style="width: 65px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:65px;"> 222,065</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;">7</td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;">years</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:9px;">$</td><td style="width: 65px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:65px;"> 387,528</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 9px; border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:9px;">$</td><td style="width: 65px; border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:65px;"> 205,363</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 30px; text-align:right;border-color:#000000;min-width:30px;">7</td><td style="width: 35px; text-align:center;border-color:#000000;min-width:35px;">years</td></tr></table></div>

CY2010Q4

wat

Intangible Assets Gross

IntangibleAssetsGross

403381000

USD

CY2010Q4

us-gaap

Finite Lived Intangible Assets Accumulated Amortization

FiniteLivedIntangibleAssetsAccumulatedAmortization

222065000

USD

CY2010

us-gaap

Finite Lived Intangible Assets Average Useful Life

FiniteLivedIntangibleAssetsAverageUsefulLife

7

pure

CY2009Q4

wat

Intangible Assets Gross

IntangibleAssetsGross

387528000

USD

CY2009Q4

us-gaap

Finite Lived Intangible Assets Accumulated Amortization

FiniteLivedIntangibleAssetsAccumulatedAmortization

205363000

USD

CY2009

us-gaap

Finite Lived Intangible Assets Average Useful Life

FiniteLivedIntangibleAssetsAverageUsefulLife

7

pure

CY2010

wat

Intangible Assets Gross Foreign Currency Translation Adjustments

IntangibleAssetsGrossForeignCurrencyTranslationAdjustments

-17000000

USD

CY2010

wat

Intangible Assets Accumulated Amortization Foreign Currency Translation Adjustments

IntangibleAssetsAccumulatedAmortizationForeignCurrencyTranslationAdjustments

-10000000

USD

CY2010

us-gaap

Future Amortization Expense Year One

FutureAmortizationExpenseYearOne

27000000

USD

CY2010

us-gaap

Future Amortization Expense Year Three

FutureAmortizationExpenseYearThree

35000000

USD

CY2010

us-gaap

Future Amortization Expense Year Four

FutureAmortizationExpenseYearFour

35000000

USD

CY2010

us-gaap

Future Amortization Expense Year Five

FutureAmortizationExpenseYearFive

35000000

USD

CY2010Q4

us-gaap

Long Term Investments

LongTermInvestments

4000000

USD

CY2009Q4

us-gaap

Long Term Investments

LongTermInvestments

4000000

USD

CY2008Q4

us-gaap

Goodwill

268000000

USD

CY2009

us-gaap

Goodwill Translation And Purchase Accounting Adjustments

GoodwillTranslationAndPurchaseAccountingAdjustments

3000000

USD

CY2010

us-gaap

Future Amortization Expense Year Two

FutureAmortizationExpenseYearTwo

35000000

USD

CY2009

wat

Intangible Assets Gross Foreign Currency Translation Adjustments

IntangibleAssetsGrossForeignCurrencyTranslationAdjustments

4000000

USD

CY2009

wat

Intangible Assets Accumulated Amortization Foreign Currency Translation Adjustments

IntangibleAssetsAccumulatedAmortizationForeignCurrencyTranslationAdjustments

3000000

USD

CY2010

us-gaap

Income Tax Reconciliation State And Local Income Taxes

IncomeTaxReconciliationStateAndLocalIncomeTaxes

2269000

USD

CY2009

us-gaap

Income Tax Reconciliation State And Local Income Taxes

IncomeTaxReconciliationStateAndLocalIncomeTaxes

2442000

USD

CY2008

us-gaap

Income Tax Reconciliation State And Local Income Taxes

IncomeTaxReconciliationStateAndLocalIncomeTaxes

1575000

USD

CY2010

us-gaap

Income Tax Reconciliation Foreign Income Tax Rate Differential

IncomeTaxReconciliationForeignIncomeTaxRateDifferential

-97312000

USD

CY2009

us-gaap

Income Tax Reconciliation Foreign Income Tax Rate Differential

IncomeTaxReconciliationForeignIncomeTaxRateDifferential

-73351000

USD

CY2008

us-gaap

Income Tax Reconciliation Foreign Income Tax Rate Differential

IncomeTaxReconciliationForeignIncomeTaxRateDifferential

-82200000

USD

CY2010

wat

Schedule Of Debt

ScheduleOfDebt

The Company had the following outstanding debt at December 31, 2010 and 2009 (in thousands):<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="5" style="width: 246px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:246px;">December 31,</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">2010</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">2009</td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Lines of credit</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 11,055</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 11,772</td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">2007 Credit Agreement, due January 2012</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 55,000</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 120,000</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;">Total notes payable and debt</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 66,055</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 131,772</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Senior unsecured notes - Series A - 3.75%, due February 2015</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> 100,000</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> -</td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Senior unsecured notes - Series B - 5.00%, due February 2020</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> 100,000</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> -</td></tr><tr style="height: 17px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">2007 Credit Agreement, due January 2012</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 500,000</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 500,000</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;">Total long-term debt</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 700,000</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 500,000</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 353px; text-align:left;border-color:#000000;min-width:353px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 18px"><td colspan="2" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Total debt</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 766,055</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 631,772</td></tr></table></div>

CY2010Q4

wat

Total Debt

TotalDebt

766055000

USD

CY2009Q4

wat

Total Debt

TotalDebt

631772000

USD

CY2010

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

71137000

USD

CY2009

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

59472000

USD

CY2008

us-gaap

Current Income Tax Expense Benefit

CurrentIncomeTaxExpenseBenefit

64837000

USD

CY2010

us-gaap

Federal Income Tax Expense Benefit Continuing Operations

FederalIncomeTaxExpenseBenefitContinuingOperations

21599000

USD

CY2009

us-gaap

Federal Income Tax Expense Benefit Continuing Operations

FederalIncomeTaxExpenseBenefitContinuingOperations

24080000

USD

CY2008

us-gaap

Federal Income Tax Expense Benefit Continuing Operations

FederalIncomeTaxExpenseBenefitContinuingOperations

1687000

USD

CY2010

us-gaap

State And Local Income Tax Expense Benefit Continuing Operations

StateAndLocalIncomeTaxExpenseBenefitContinuingOperations

3491000

USD

CY2009

us-gaap

State And Local Income Tax Expense Benefit Continuing Operations

StateAndLocalIncomeTaxExpenseBenefitContinuingOperations

3757000

USD

CY2008

us-gaap

State And Local Income Tax Expense Benefit Continuing Operations

StateAndLocalIncomeTaxExpenseBenefitContinuingOperations

2422000

USD

CY2010

us-gaap

Foreign Income Tax Expense Benefit Continuing Operations

ForeignIncomeTaxExpenseBenefitContinuingOperations

31010000

USD

CY2009

us-gaap

Foreign Income Tax Expense Benefit Continuing Operations

ForeignIncomeTaxExpenseBenefitContinuingOperations

35502000

USD

CY2008

us-gaap

Foreign Income Tax Expense Benefit Continuing Operations

ForeignIncomeTaxExpenseBenefitContinuingOperations

45604000

USD

CY2008

us-gaap

Income Tax Reconciliation Other Adjustments

IncomeTaxReconciliationOtherAdjustments

71000

USD

CY2010

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

-15037000

USD

CY2009

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

3867000

USD

CY2008

us-gaap

Deferred Income Tax Expense Benefit

DeferredIncomeTaxExpenseBenefit

-15124000

USD

CY2010Q4

wat

Net Operating Loss Carryforwards And Credits Deferred Tax Assets

NetOperatingLossCarryforwardsAndCreditsDeferredTaxAssets

21359000

USD

CY2009Q4

wat

Net Operating Loss Carryforwards And Credits Deferred Tax Assets

NetOperatingLossCarryforwardsAndCreditsDeferredTaxAssets

83515000

USD

CY2010Q4

wat

Depreciation And Capitalized Software Deferred Tax Assets

DepreciationAndCapitalizedSoftwareDeferredTaxAssets

10339000

USD

CY2009Q4

wat

Depreciation And Capitalized Software Deferred Tax Assets

DepreciationAndCapitalizedSoftwareDeferredTaxAssets

7462000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

24477000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

24858000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Equity Method Investments

DeferredTaxAssetsEquityMethodInvestments

5896000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Equity Method Investments

DeferredTaxAssetsEquityMethodInvestments

6159000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Inventory

DeferredTaxAssetsInventory

3093000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Inventory

DeferredTaxAssetsInventory

2960000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Reserves And Accruals

DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

23976000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Reserves And Accruals

DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

11746000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Other

DeferredTaxAssetsOther

8711000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Other

DeferredTaxAssetsOther

9316000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Gross

DeferredTaxAssetsGross

119288000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Gross

DeferredTaxAssetsGross

163614000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Valuation Allowance

DeferredTaxAssetsValuationAllowance

10361000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Valuation Allowance

DeferredTaxAssetsValuationAllowance

83683000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Net

DeferredTaxAssetsNet

108927000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Net

DeferredTaxAssetsNet

79931000

USD

CY2010Q4

wat

Depreciation And Capitalized Software Deferred Tax Liabilities

DepreciationAndCapitalizedSoftwareDeferredTaxLiabilities

10877000

USD

CY2009Q4

wat

Depreciation And Capitalized Software Deferred Tax Liabilities

DepreciationAndCapitalizedSoftwareDeferredTaxLiabilities

9060000

USD

CY2010Q4

us-gaap

Deferred Tax Liabilities Goodwill And Intangible Assets

DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

10308000

USD

CY2009Q4

us-gaap

Deferred Tax Liabilities Goodwill And Intangible Assets

DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

12014000

USD

CY2010Q4

wat

Indefinite Lived Intangibles Deferred Tax Liabilities

IndefiniteLivedIntangiblesDeferredTaxLiabilities

19901000

USD

CY2009Q4

wat

Indefinite Lived Intangibles Deferred Tax Liabilities

IndefiniteLivedIntangiblesDeferredTaxLiabilities

18764000

USD

CY2010Q4

us-gaap

Deferred Tax Liabilities Other

DeferredTaxLiabilitiesOther

119000

USD

CY2009Q4

us-gaap

Deferred Tax Liabilities Other

DeferredTaxLiabilitiesOther

197000

USD

CY2010Q4

us-gaap

Deferred Tax Liabilities

DeferredTaxLiabilities

41205000

USD

CY2009Q4

us-gaap

Deferred Tax Liabilities

DeferredTaxLiabilities

40035000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Liabilities Net

DeferredTaxAssetsLiabilitiesNet

67722000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Liabilities Net

DeferredTaxAssetsLiabilitiesNet

39896000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

21437000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation

DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation

17598000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Net Current

DeferredTaxAssetsNetCurrent

48000000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Net Current

DeferredTaxAssetsNetCurrent

21000000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Net Noncurrent

DeferredTaxAssetsNetNoncurrent

20000000

USD

CY2009Q4

us-gaap

Deferred Tax Assets Net Noncurrent

DeferredTaxAssetsNetNoncurrent

19000000

USD

CY2010Q4

wat

Domestic Federal And State Net Operating Loss Carryforward Deferred Tax Assets

DomesticFederalAndStateNetOperatingLossCarryforwardDeferredTaxAssets

less than $1 million

CY2009Q4

us-gaap

Deferred Tax Assets Tax Credit Carryforwards Foreign

DeferredTaxAssetsTaxCreditCarryforwardsForeign

71000000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Tax Credit Carryforwards Foreign

DeferredTaxAssetsTaxCreditCarryforwardsForeign

14000000

USD

CY2010Q4

us-gaap

Deferred Tax Assets Tax Credit Carryforwards Research

DeferredTaxAssetsTaxCreditCarryforwardsResearch

13000000

USD

CY2010Q4

wat

Foreign Net Operating Loss Deferred Tax Assets Pre Tax

ForeignNetOperatingLossDeferredTaxAssetsPreTax

2000000

USD

CY2010Q4

wat

Unrecognized Domestic Federal And State Net Operating Loss Carryforward Deferred Tax Assets

UnrecognizedDomesticFederalAndStateNetOperatingLossCarryforwardDeferredTaxAssets

14000000

USD

CY2010Q4

wat

Unrecognized Domestic Federal And State Net Operating Loss Carryforward Deferred Tax Assets Pre Tax

UnrecognizedDomesticFederalAndStateNetOperatingLossCarryforwardDeferredTaxAssetsPreTax

38000000

USD

CY2010

wat

Unremitted Earnings Of Foreign Subsidiaries

UnremittedEarningsOfForeignSubsidiaries

1700000000

USD

CY2010Q4

wat

Foreign Net Operating Loss Deferred Tax Assets Less Than1 Million

ForeignNetOperatingLossDeferredTaxAssetsLessThan1Million

less than $1 million

CY2010Q4

us-gaap

Operating Leases Future Minimum Payments Due Current

OperatingLeasesFutureMinimumPaymentsDueCurrent

23881000

USD

CY2008

us-gaap

Employee Stock Ownership Plan Esop Compensation Expense

EmployeeStockOwnershipPlanESOPCompensationExpense

1000000

USD

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

45000000

USD

CY2009

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

13000000

USD

CY2008

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

26000000

USD

CY2010Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

154000000

USD

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm

4.2

pure

CY2007Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

68463000

USD

CY2008Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

77295000

USD

CY2009Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

77924000

USD

CY2010Q4

us-gaap

Unrecognized Tax Benefits

UnrecognizedTaxBenefits

71523000

USD

CY2010

wat

Increase In Other Uncertain Tax Benefits

IncreaseInOtherUncertainTaxBenefits

5095000

USD

CY2009

wat

Increase In Other Uncertain Tax Benefits

IncreaseInOtherUncertainTaxBenefits

5184000

USD

CY2008

wat

Increase In Other Uncertain Tax Benefits

IncreaseInOtherUncertainTaxBenefits

3832000

USD

CY2010

wat

Percentage Point Change In Effective Tax Rate

PercentagePointChangeInEffectiveTaxRate

-2.1

pure

CY2010

wat

Litigation

10  Litigation The Company is involved in various litigation matters arising in the ordinary course of business. The Company believes the outcome of these matters will not have a material impact on the Company's financial position, results of operations or cash flows. The Company has been engaged in ongoing patent litigation with Agilent Technologies GmbH in France and Germany. In January 2009, the French appeals court affirmed that the Company had infringed the Agilent Technologies GmbH patent and a judgment was issued against the Company. The Company has appealed this judgment. In 2008, the Company recorded a $7 million provision and, in the first quarter of 2009, the Company made a payment of $6 million for damages and fees estimated to be incurred in connection with the French litigation case. The accrued patent litigation expense is in other current liabilities in the consolidated balance sheets at December 31, 2010 and 2009. No provision has been made for the German patent litigation and the Company believes the outcome, if the plaintiff ultimately prevails, will not have a material impact on the Company's financial position.

CY2009Q2

us-gaap

Payments For Legal Settlements

PaymentsForLegalSettlements

6000000

USD

CY2010Q4

us-gaap

Operating Leases Future Minimum Payments Due In Two Years

OperatingLeasesFutureMinimumPaymentsDueInTwoYears

18169000

USD

CY2010Q4

us-gaap

Operating Leases Future Minimum Payments Due In Three Years

OperatingLeasesFutureMinimumPaymentsDueInThreeYears

12033000

USD

CY2010Q4

us-gaap

Operating Leases Future Minimum Payments Due In Four Years

OperatingLeasesFutureMinimumPaymentsDueInFourYears

7594000

USD

CY2010Q4

wat

Future Minimum Rents Payable In Five Years And Thereafter

FutureMinimumRentsPayableInFiveYearsAndThereafter

13314000

USD

CY2010

us-gaap

Lease And Rental Expense

LeaseAndRentalExpense

27000000

USD

CY2009

us-gaap

Lease And Rental Expense

LeaseAndRentalExpense

34000000

USD

CY2008

us-gaap

Lease And Rental Expense

LeaseAndRentalExpense

30000000

USD

CY2010

wat

License Fees Paid Less Than1 Million

LicenseFeesPaidLessThan1Million

less than $1 million

CY2009

wat

License Fees Paid Less Than1 Million

LicenseFeesPaidLessThan1Million

less than $1 million

CY2008

wat

License Fees Paid Less Than1 Million

LicenseFeesPaidLessThan1Million

less than $1 million

CY2010

wat

Purchase Price Calculation For Shares Of Stock Under Employee Stock Purchase Plan

PurchasePriceCalculationForSharesOfStockUnderEmployeeStockPurchasePlan

The purchase price for each share of stock is the lesser of 90% of the market price on the first day of the plan period or 100% of the market price on the last day of the plan period.

CY2010Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant

ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

2200000

shares

CY2010Q4

wat

Maximum Contribution Allowed Under Employee Stock Purchase Plan As Of Employees Earnings

MaximumContributionAllowedUnderEmployeeStockPurchasePlanAsOfEmployeesEarnings

0.15

pure

CY2010Q4

wat

Total Number Of Shares Authorized For Purchase Under Employee Stock Purchase Plan

TotalNumberOfSharesAuthorizedForPurchaseUnderEmployeeStockPurchasePlan

900000

shares

CY2010Q4

wat

Total Number Of Shares Purchased Under Employee Stock Purchase Plan

TotalNumberOfSharesPurchasedUnderEmployeeStockPurchasePlan

1000000

shares

CY2009

us-gaap

Employee Stock Ownership Plan Esop Compensation Expense

EmployeeStockOwnershipPlanESOPCompensationExpense

1000000

USD

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm

5.6

pure

CY2010

us-gaap

Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Awards Weighted Average Period Of Recognition

EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsWeightedAveragePeriodOfRecognition

3.7

pure

CY2009Q4

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions

5100000

shares

CY2009Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

45.17

CY2008Q4

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions

4900000

shares

CY2008Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

43.18

CY2010

wat

Compensation Expense Related To Employee Stock Purchase Plan Less Than1 Million

CompensationExpenseRelatedToEmployeeStockPurchasePlanLessThan1Million

less than $1 million

CY2010Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber

5500000

shares

CY2010Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

153000000

USD

CY2010Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice

50.01

CY2009

us-gaap

Allocated Share Based Compensation Expense

AllocatedShareBasedCompensationExpense

28255000

USD

CY2010

us-gaap

Allocated Share Based Compensation Expense

AllocatedShareBasedCompensationExpense

24852000

USD

CY2008

us-gaap

Allocated Share Based Compensation Expense

AllocatedShareBasedCompensationExpense

30782000

USD

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod

667000

shares

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm

6

pure

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Payments

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments

0

USD

CY2009

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod

608000

shares

CY2009

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm

6

pure

CY2009

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Payments

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments

0

USD

CY2008

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod

583000

shares

CY2008

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm

6

pure

CY2008

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Payments

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments

0

USD

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

0.271

pure

CY2009

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

0.305

pure

CY2010

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice

43.45

CY2008

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

0.557

pure

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

0.020

pure

CY2009

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

0.029

pure

CY2008

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate

ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

0.021

pure

CY2010

wat

Weighted Average Exercise Price Of Options Granted

WeightedAverageExercisePriceOfOptionsGranted

78.21

CY2009

wat

Weighted Average Exercise Price Of Options Granted

WeightedAverageExercisePriceOfOptionsGranted

58.46

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

23.97

CY2009

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

20.65

CY2008

wat

Weighted Average Exercise Price Of Options Granted

WeightedAverageExercisePriceOfOptionsGranted

42.91

CY2008

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

22.69

CY2010

wat

Stock Options Outstanding Roll Forward

StockOptionsOutstandingRollForward

The following table summarizes stock option activity for the plans for the year ended December 31, 2010 (in thousands, except per share data):<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 42px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;">Number of Shares</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="5" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">Price per Share</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">Weighted-Average Exercise Price</td></tr><tr style="height: 17px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Outstanding at December 31, 2009</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;">6,857</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:36px;">21.05</td><td style="width: 21px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:21px;">to</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:36px;">80.97</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;">47.58</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;">Granted</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">667</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;">61.63</td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;">to</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;">79.05</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">78.21</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;">Exercised</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">(1,933)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;">21.05</td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;">to</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;">77.94</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">50.31</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;">Canceled</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;">(31)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;">49.31</td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;">to</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;">72.06</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">68.27</td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Outstanding at December 31, 2010</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">5,560</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;">21.39</td><td style="width: 21px; text-align:center;border-color:#000000;min-width:21px;">to</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 36px; text-align:right;border-color:#000000;min-width:36px;">80.97</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">50.19</td></tr></table></div>

CY2009Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

6857000

shares

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod

-1933000

shares

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod

-31000

shares

CY2010Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

5560000

shares

CY2009Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

47.58

CY2010

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice

68.27

CY2010Q4

us-gaap

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

50.19

CY2010Q4

wat

Exercise Price Range Of Options Outstanding Lower Range Limit

ExercisePriceRangeOfOptionsOutstandingLowerRangeLimit

21.39

CY2010Q4

wat

Exercise Price Range Of Options Outstanding Upper Range Limit

ExercisePriceRangeOfOptionsOutstandingUpperRangeLimit

80.97

CY2009Q4

wat

Exercise Price Range Of Options Outstanding Lower Range Limit

ExercisePriceRangeOfOptionsOutstandingLowerRangeLimit

21.05

CY2009Q4

wat

Exercise Price Range Of Options Outstanding Upper Range Limit

ExercisePriceRangeOfOptionsOutstandingUpperRangeLimit

80.97

CY2010

wat

Weighted Average Exercise Price Of Options Exercised

WeightedAverageExercisePriceOfOptionsExercised

50.31

CY2010

wat

Exercise Price Range Of Options Exercised Lower Range Limit

ExercisePriceRangeOfOptionsExercisedLowerRangeLimit

21.05

CY2010

wat

Exercise Price Range Of Options Exercised Upper Range Limit

ExercisePriceRangeOfOptionsExercisedUpperRangeLimit

77.94

CY2010

wat

Exercise Price Range Of Options Canceled Lower Range Limit

ExercisePriceRangeOfOptionsCanceledLowerRangeLimit

49.31

CY2010

wat

Exercise Price Range Of Options Canceled Upper Range Limit

ExercisePriceRangeOfOptionsCanceledUpperRangeLimit

72.06

CY2010

wat

Exercise Price Range Of Options Granted Lower Range Limit

ExercisePriceRangeOfOptionsGrantedLowerRangeLimit

61.63

CY2010

wat

Exercise Price Range Of Options Granted Upper Range Limit

ExercisePriceRangeOfOptionsGrantedUpperRangeLimit

79.05

CY2010Q4

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions

5560000

shares

CY2010

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance

50.19

CY2010

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm

5.7

pure

CY2010Q4

us-gaap

Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options

ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions

3737000

shares

CY2010

wat

Restricted Stock Units Unvested Roll Forward

RestrictedStockUnitsUnvestedRollForward

The following table summarizes the unvested restricted stock unit award activity for the year ended December 31, 2010 (in thousands, except for per share amounts):<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 38px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 365px; text-align:left;border-color:#000000;min-width:365px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;">Shares</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">Weighted-Average Price</td></tr><tr style="height: 17px"><td colspan="2" style="width: 377px; text-align:left;border-color:#000000;min-width:377px;">Unvested at December 31, 2009</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;">783</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:105px;">45.30</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Granted</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">217</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">62.29</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Vested</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">(218)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">46.98</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Forfeited</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;">(30)</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">47.20</td></tr><tr style="height: 18px"><td colspan="2" style="width: 377px; text-align:left;border-color:#000000;min-width:377px;">Unvested at December 31, 2010</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 752</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;">49.64</td></tr></table></div>

CY2010

wat

Earnings Per Share Reconciliation

EarningsPerShareReconciliation

Basic and diluted earnings per share (“EPS”) calculations are detailed as follows (in thousands, except per share data):<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 18px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="7" style="width: 363px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:363px;">Year Ended December 31, 2010</td></tr><tr style="height: 34px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:117px;">Net Income</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:105px;">Weighted-Average Shares</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:117px;">Per Share</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">(Numerator)</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;">(Denominator)</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">Amount</td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Net income per basic common share</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">381,763</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 92,385</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">4.13</td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Effect of dilutive stock option, restricted </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;">stock and restricted stock unit securities:</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;">Outstanding</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> 1,372</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;">Exercised and cancellations</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 300</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Net income per diluted common share</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">381,763</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 94,057</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">4.06</td></tr></table></div><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 18px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="7" style="width: 363px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:363px;">Year Ended December 31, 2009</td></tr><tr style="height: 34px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:117px;">Net Income</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:105px;">Weighted-Average Shares</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:117px;">Per Share</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">(Numerator)</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;">(Denominator)</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">Amount</td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Net income per basic common share</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">323,313</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 95,797</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">3.37</td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Effect of dilutive stock option, restricted </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;">stock and restricted stock unit securities:</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;">Outstanding</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> 939</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;">Exercised and cancellations</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 126</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Net income per diluted common share</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">323,313</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 96,862</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">3.34</td></tr></table></div><div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 18px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="7" style="width: 363px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:363px;">Year Ended December 31, 2008</td></tr><tr style="height: 34px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:117px;">Net Income</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:105px;">Weighted-Average Shares</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:117px;">Per Share</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">(Numerator)</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:105px;">(Denominator)</td><td style="width: 12px; text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 117px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:117px;">Amount</td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Net income per basic common share</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">322,479</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 99,199</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">3.25</td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Effect of dilutive stock option, restricted </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:double;border-top-width:3px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 236px; text-align:left;border-color:#000000;min-width:236px;">stock and restricted stock unit securities:</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;">Outstanding</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> 1,161</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 224px; text-align:left;border-color:#000000;min-width:224px;">Exercised and cancellations</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> 195</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:105px;"> </td></tr><tr style="height: 18px"><td colspan="3" style="width: 248px; text-align:left;border-color:#000000;min-width:248px;">Net income per diluted common share</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:center;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">322,479</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;"> 100,555</td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:left;border-color:#000000;min-width:12px;">$</td><td style="width: 105px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:105px;">3.21</td></tr></table></div>

CY2009

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

968000

USD

CY2009

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

1798000

USD

CY2009

wat

Other Comprehensive Income Net Foreign Currency Adjustments

OtherComprehensiveIncomeNetForeignCurrencyAdjustments

21203000

USD

CY2010

wat

Effect Of Dilutive Stock Option Restricted Stock And Restricted Stock Unit Securities Outstanding

EffectOfDilutiveStockOptionRestrictedStockAndRestrictedStockUnitSecuritiesOutstanding

1372000

shares

CY2010

wat

Effect Of Dilutive Stock Option Restricted Stock And Restricted Stock Unit Securities Exercised And Cancellations

EffectOfDilutiveStockOptionRestrictedStockAndRestrictedStockUnitSecuritiesExercisedAndCancellations

300000

shares

CY2009

wat

Effect Of Dilutive Stock Option Restricted Stock And Restricted Stock Unit Securities Outstanding

EffectOfDilutiveStockOptionRestrictedStockAndRestrictedStockUnitSecuritiesOutstanding

939000

shares

CY2009

wat

Effect Of Dilutive Stock Option Restricted Stock And Restricted Stock Unit Securities Exercised And Cancellations

EffectOfDilutiveStockOptionRestrictedStockAndRestrictedStockUnitSecuritiesExercisedAndCancellations

126000

shares

CY2008

wat

Effect Of Dilutive Stock Option Restricted Stock And Restricted Stock Unit Securities Outstanding

EffectOfDilutiveStockOptionRestrictedStockAndRestrictedStockUnitSecuritiesOutstanding

1161000

shares

CY2008

wat

Effect Of Dilutive Stock Option Restricted Stock And Restricted Stock Unit Securities Exercised And Cancellations

EffectOfDilutiveStockOptionRestrictedStockAndRestrictedStockUnitSecuritiesExercisedAndCancellations

195000

shares

CY2010

wat

Schedule Of Comprehensive Income

ScheduleOfComprehensiveIncome

Comprehensive income is detailed as follows (in thousands):<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 329px; text-align:left;border-color:#000000;min-width:329px;"> </td><td colspan="8" style="width: 246px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:246px;">Year Ended December 31,</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 329px; text-align:left;border-color:#000000;min-width:329px;"> </td><td colspan="2" style="width: 74px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;">2010</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 74px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;">2009</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 74px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:74px;">2008</td></tr><tr style="height: 17px"><td colspan="5" style="width: 377px; text-align:left;border-color:#000000;min-width:377px;">Net income</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;">$</td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 381,763</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;">$</td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 323,313</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;">$</td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 322,479</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="3" style="width: 353px; text-align:left;border-color:#000000;min-width:353px;">Foreign currency translation</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> (24,568)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> 19,405</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> (53,704)</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 341px; text-align:left;border-color:#000000;min-width:341px;">Net appreciation (depreciation) and realized gains (losses)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:left;border-color:#000000;min-width:62px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:left;border-color:#000000;min-width:62px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:left;border-color:#000000;min-width:62px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 329px; text-align:left;border-color:#000000;min-width:329px;">on derivative instruments</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> -</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> 2,766</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> (798)</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 341px; text-align:left;border-color:#000000;min-width:341px;">Income tax (expense) benefit</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> -</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (968)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 279</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="3" style="width: 353px; text-align:left;border-color:#000000;min-width:353px;">Net appreciation (depreciation) and realized gains (losses)</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> </td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="2" style="width: 341px; text-align:left;border-color:#000000;min-width:341px;">on derivative instruments, net of tax</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> -</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 1,798</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (519)</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="4" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Net foreign currency adjustments</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (24,568)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 21,203</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (54,223)</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="3" style="width: 353px; text-align:left;border-color:#000000;min-width:353px;">Unrealized gains (losses) on investments before income taxes</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> 19</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> (38)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; text-align:right;border-color:#000000;min-width:62px;"> (191)</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="3" style="width: 353px; text-align:left;border-color:#000000;min-width:353px;">Income tax (expense) benefit</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (7)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 13</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 67</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="4" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Unrealized gains (losses) on investments, net of tax</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 12</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (25)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (124)</td></tr><tr style="height: 17px"><td style="width: 12px; text-align:left;border-color:#000000;min-width:12px;"> </td><td colspan="4" style="width: 365px; text-align:left;border-color:#000000;min-width:365px;">Retirement liability adjustment, net of tax</td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (2,813)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 2,977</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (20,466)</td></tr><tr style="height: 17px"><td colspan="5" style="width: 377px; text-align:left;border-color:#000000;min-width:377px;">Other comprehensive (loss) income</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (27,369)</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> 24,155</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:62px;"> (74,813)</td></tr><tr style="height: 18px"><td colspan="5" style="width: 377px; text-align:left;border-color:#000000;min-width:377px;">Comprehensive income</td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:12px;">$</td><td style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:62px;"> 354,394</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:12px;">$</td><td style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:62px;"> 347,468</td><td style="width: 12px; text-align:right;border-color:#000000;min-width:12px;"> </td><td style="width: 12px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:12px;">$</td><td style="width: 62px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:62px;"> 247,666</td></tr></table></div>

CY2010

us-gaap

Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax

OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

-24568000

USD

CY2010

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

0

USD

CY2010

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

0

USD

CY2010

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

0

USD

CY2010

wat

Other Comprehensive Income Net Foreign Currency Adjustments

OtherComprehensiveIncomeNetForeignCurrencyAdjustments

-24568000

USD

CY2010

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

19000

USD

CY2010

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

7000

USD

CY2010

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

12000

USD

CY2010

us-gaap

Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease

OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease

-2813000

USD

CY2010

us-gaap

Other Comprehensive Income Loss Net Of Tax Period Increase Decrease

OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease

-27369000

USD

CY2010

us-gaap

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

354394000

USD

CY2009

us-gaap

Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax

OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

19405000

USD

CY2009

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

2766000

USD

CY2009

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

-38000

USD

CY2009

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

-13000

USD

CY2009

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

-25000

USD

CY2009

us-gaap

Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease

OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease

2977000

USD

CY2009

us-gaap

Other Comprehensive Income Loss Net Of Tax Period Increase Decrease

OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease

24155000

USD

CY2009

us-gaap

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

347468000

USD

CY2008

us-gaap

Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax

OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax

-53704000

USD

CY2008

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

-798000

USD

CY2008

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

-279000

USD

CY2008

us-gaap

Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax

OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

-519000

USD

CY2008

wat

Other Comprehensive Income Net Foreign Currency Adjustments

OtherComprehensiveIncomeNetForeignCurrencyAdjustments

-54223000

USD

CY2008

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax

-191000

USD

CY2008

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

-67000

USD

CY2008

us-gaap

Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax

OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

-124000

USD

CY2008

us-gaap

Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease

OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecrease

-20466000

USD

CY2008

us-gaap

Other Comprehensive Income Loss Net Of Tax Period Increase Decrease

OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease

-74813000

USD

CY2008

us-gaap

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

247666000

USD

CY2010

wat

Defined Benefit Plan Interest Crediting Rate

DefinedBenefitPlanInterestCreditingRate

The interest rate is the one-year constant maturity Treasury bond yield in effect as of the first business day in November preceding such year plus 0.5%, limited to a minimum interest crediting rate of 5% and a maximum interest crediting rate of 10%.

CY2008Q1

wat

Special Contribution To Retirement Plan

SpecialContributionToRetirementPlan

13000000

USD

CY2010Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

108929000

USD

CY2009Q4

us-gaap

Defined Benefit Plan Fair Value Of Plan Assets

DefinedBenefitPlanFairValueOfPlanAssets

96674000

USD

CY2010Q3

us-gaap

Sales Revenue Net

SalesRevenueNet

391055000

USD

CY2010Q3

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

155133000

USD

CY2010Q3

us-gaap

Gross Profit

GrossProfit

235922000

USD

CY2010Q3

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

106939000

USD

CY2010Q3

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

20807000

USD

CY2010Q3

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

2592000

USD

CY2010Q4

wat

Estimated Future Employer Contributions To Defined Benefit Plans In Next Fiscal Year Range Minimum

EstimatedFutureEmployerContributionsToDefinedBenefitPlansInNextFiscalYearRangeMinimum

3000000

USD

CY2010Q4

wat

Estimated Future Employer Contributions To Defined Benefit Plans In Next Fiscal Year Range Maximum

EstimatedFutureEmployerContributionsToDefinedBenefitPlansInNextFiscalYearRangeMaximum

5000000

USD

CY2010Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments In Year One

DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearOne

5433000

USD

CY2010Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments In Year Two

DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearTwo

5324000

USD

CY2010Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments In Year Three

DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearThree

6312000

USD

CY2010Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments In Year Four

DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFour

7878000

USD

CY2010Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments In Year Five

DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFive

8731000

USD

CY2010Q4

us-gaap

Defined Benefit Plan Expected Future Benefit Payments In Five Fiscal Years Thereafter

DefinedBenefitPlanExpectedFutureBenefitPaymentsInFiveFiscalYearsThereafter

58120000

USD

CY2010Q2

us-gaap

Interest Expense

InterestExpense

2614000

USD

CY2010Q2

us-gaap

Investment Income Interest

InvestmentIncomeInterest

329000

USD

CY2010Q2

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

90072000

USD

CY2010Q2

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

14554000

USD

CY2010Q2

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

75518000

USD

CY2010Q2

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

0.81

CY2010Q2

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

93629000

shares

CY2010Q2

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

0.79

CY2010Q2

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

95223000

shares

CY2010Q3

us-gaap

Operating Income Loss

OperatingIncomeLoss

105584000

USD

CY2010Q3

us-gaap

Interest Expense

InterestExpense

3621000

USD

CY2010Q3

us-gaap

Investment Income Interest

InvestmentIncomeInterest

448000

USD

CY2010

wat

Percent Of Net Sales Derived From Operations Outside United States

PercentOfNetSalesDerivedFromOperationsOutsideUnitedStates

0.70

pure

CY2009

wat

Percent Of Net Sales Derived From Operations Outside United States

PercentOfNetSalesDerivedFromOperationsOutsideUnitedStates

0.69

pure

CY2008

wat

Percent Of Net Sales Derived From Operations Outside United States

PercentOfNetSalesDerivedFromOperationsOutsideUnitedStates

0.70

pure

CY2010Q2

us-gaap

Sales Revenue Net

SalesRevenueNet

367700000

USD

CY2010Q2

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

145932000

USD

CY2010Q2

us-gaap

Gross Profit

GrossProfit

221768000

USD

CY2010Q2

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

106693000

USD

CY2010Q2

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

20076000

USD

CY2010Q2

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

2642000

USD

CY2010Q2

us-gaap

Operating Income Loss

OperatingIncomeLoss

92357000

USD

CY2010Q3

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

102411000

USD

CY2010Q3

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

17489000

USD

CY2010Q3

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

84922000

USD

CY2010Q3

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

0.92

CY2010Q3

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

92612000

shares

CY2010Q3

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

0.90

CY2010Q3

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

94278000

shares

CY2010Q4

us-gaap

Sales Revenue Net

SalesRevenueNet

401038000

USD

CY2010Q4

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

162985000

USD

CY2010Q4

us-gaap

Gross Profit

GrossProfit

238053000

USD

CY2010Q4

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

111306000

USD

CY2010Q4

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

20524000

USD

CY2010Q4

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

2408000

USD

CY2010Q4

us-gaap

Operating Income Loss

OperatingIncomeLoss

103815000

USD

CY2010Q4

us-gaap

Interest Expense

InterestExpense

3810000

USD

CY2010Q4

us-gaap

Investment Income Interest

InvestmentIncomeInterest

516000

USD

CY2010Q4

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

100521000

USD

CY2010Q4

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

5802000

USD

CY2010Q4

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

94719000

USD

CY2010Q4

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

1.03

CY2010Q4

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

91714000

shares

CY2010Q4

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

1.02

CY2010Q4

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

93286000

shares

CY2010Q4

us-gaap

Sales Revenue Net

SalesRevenueNet

483578000

USD

CY2010Q4

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

189253000

USD

CY2010Q4

us-gaap

Gross Profit

GrossProfit

294325000

USD

CY2010Q4

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

120518000

USD

CY2010Q4

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

22867000

USD

CY2010Q4

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

2764000

USD

CY2010Q4

us-gaap

Operating Income Loss

OperatingIncomeLoss

148176000

USD

CY2010Q4

us-gaap

Interest Expense

InterestExpense

3879000

USD

CY2010Q4

us-gaap

Investment Income Interest

InvestmentIncomeInterest

562000

USD

CY2010Q4

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

144859000

USD

CY2010Q4

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

18255000

USD

CY2010Q4

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

126604000

USD

CY2010Q4

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

1.38

CY2010Q4

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

91583000

shares

CY2010Q4

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

1.36

CY2010Q4

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

93344000

shares

CY2009Q2

us-gaap

Sales Revenue Net

SalesRevenueNet

333052000

USD

CY2009Q2

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

127454000

USD

CY2009Q2

us-gaap

Gross Profit

GrossProfit

205598000

USD

CY2009Q2

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

99159000

USD

CY2009Q2

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

18332000

USD

CY2009Q2

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

2616000

USD

CY2009Q2

us-gaap

Operating Income Loss

OperatingIncomeLoss

85491000

USD

CY2009Q2

us-gaap

Interest Expense

InterestExpense

3130000

USD

CY2009Q2

us-gaap

Investment Income Interest

InvestmentIncomeInterest

908000

USD

CY2009Q2

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

83269000

USD

CY2009Q2

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

9922000

USD

CY2009Q2

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

73347000

USD

CY2009Q2

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

0.75

CY2009Q2

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

97304000

shares

CY2009Q2

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

0.75

CY2009Q2

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

97927000

shares

CY2009Q3

us-gaap

Sales Revenue Net

SalesRevenueNet

362837000

USD

CY2009Q3

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

144154000

USD

CY2009Q3

us-gaap

Gross Profit

GrossProfit

218683000

USD

CY2009Q3

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

109583000

USD

CY2009Q3

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

19722000

USD

CY2009Q3

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

2683000

USD

CY2009Q3

us-gaap

Operating Income Loss

OperatingIncomeLoss

86695000

USD

CY2009Q3

us-gaap

Interest Expense

InterestExpense

2649000

USD

CY2009Q3

us-gaap

Investment Income Interest

InvestmentIncomeInterest

595000

USD

CY2009Q3

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

84641000

USD

CY2009Q3

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

14734000

USD

CY2009Q3

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

69907000

USD

CY2009Q3

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

0.73

CY2009Q3

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

96147000

shares

CY2009Q3

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

0.72

CY2009Q3

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

96996000

shares

CY2009Q4

us-gaap

Sales Revenue Net

SalesRevenueNet

373963000

USD

CY2009Q4

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

153143000

USD

CY2009Q4

us-gaap

Gross Profit

GrossProfit

220820000

USD

CY2009Q4

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

102675000

USD

CY2009Q4

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

19310000

USD

CY2009Q4

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

2723000

USD

CY2009Q4

us-gaap

Operating Income Loss

OperatingIncomeLoss

96112000

USD

CY2009Q4

us-gaap

Interest Expense

InterestExpense

2864000

USD

CY2009Q4

us-gaap

Investment Income Interest

InvestmentIncomeInterest

785000

USD

CY2009Q4

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

94033000

USD

CY2009Q4

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

18097000

USD

CY2009Q4

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

75936000

USD

CY2009Q4

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

0.80

CY2009Q4

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

95235000

shares

CY2009Q4

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

0.79

CY2009Q4

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

96513000

shares

CY2009Q4

us-gaap

Sales Revenue Net

SalesRevenueNet

428848000

USD

CY2009Q4

us-gaap

Cost Of Goods And Services Sold

CostOfGoodsAndServicesSold

170131000

USD

CY2009Q4

us-gaap

Gross Profit

GrossProfit

258717000

USD

CY2009Q4

us-gaap

Selling General And Administrative Expense

SellingGeneralAndAdministrativeExpense

109986000

USD

CY2009Q4

us-gaap

Research And Development Expense

ResearchAndDevelopmentExpense

19790000

USD

CY2009Q4

wat

Purchased Intangibles Amortization

PurchasedIntangiblesAmortization

2637000

USD

CY2009Q4

us-gaap

Operating Income Loss

OperatingIncomeLoss

126304000

USD

CY2009Q4

us-gaap

Interest Expense

InterestExpense

2343000

USD

CY2009Q4

us-gaap

Investment Income Interest

InvestmentIncomeInterest

748000

USD

CY2009Q4

us-gaap

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

124709000

USD

CY2009Q4

us-gaap

Income Tax Expense Benefit

IncomeTaxExpenseBenefit

20586000

USD

CY2009Q4

us-gaap

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

104123000

USD

CY2009Q4

us-gaap

Income Loss From Continuing Operations Per Basic Share

IncomeLossFromContinuingOperationsPerBasicShare

1.10

CY2009Q4

us-gaap

Weighted Average Number Of Shares Outstanding Basic

WeightedAverageNumberOfSharesOutstandingBasic

94516000

shares

CY2009Q4

us-gaap

Income Loss From Continuing Operations Per Diluted Share

IncomeLossFromContinuingOperationsPerDilutedShare

1.08

CY2009Q4

us-gaap

Weighted Average Number Of Diluted Shares Outstanding

WeightedAverageNumberOfDilutedSharesOutstanding

96111000

shares

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$WAT
WATERS CORP /DE/ Stock $wat

2011 Q1 Form 10-K Financial Statement

#000095012311018381 Filed on February 25, 2011

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WAT WATERS CORP /DE/ Stock $wat

2011 Q1 Form 10-K Financial Statement

#000095012311018381 Filed on February 25, 2011

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WAT
WATERS CORP /DE/ Stock $wat