$TER
TERADYNE, INC Stock $ter

$ter Overview Financials Valuation SEC Filings Company Website

2018 Q1 Form 10-K Financial Statement

#000119312518066579 Filed on March 01, 2018

Income Statement

Concept	2018 Q1	2017 Q4	2017 Q3
Revenue		$503.4M	$696.9M
YoY Change		22.63%	31.05%
Cost Of Revenue		$206.5M	$305.7M
YoY Change		12.76%	22.8%
Gross Profit		$270.9M	$390.6M
YoY Change		19.16%	38.1%
Gross Profit Margin		53.82%	56.05%
Selling, General & Admin		$87.88M	$90.11M
YoY Change		11.53%	10.67%
% of Gross Profit		32.44%	23.07%
Research & Development		$72.07M	$82.27M
YoY Change		0.94%	8.09%
% of Gross Profit		26.6%	21.06%
Depreciation & Amortization		$26.60M	$27.70M
YoY Change		5.14%	-15.29%
% of Gross Profit		9.82%	7.09%
Operating Expenses		$176.3M	$182.8M
YoY Change		3.19%	-64.48%
Operating Profit		$94.63M	$207.8M
YoY Change		67.48%	-189.65%
Interest Expense		$5.380M	$5.509M
YoY Change		749.92%	697.25%
% of Operating Profit		5.69%	2.65%
Other Income/Expense, Net		-$840.0K	$1.291M
YoY Change		-191.21%	14244.44%
Pretax Income		$98.08M	$206.9M
YoY Change		64.35%	-189.63%
Income Tax		$204.0M	$31.90M
% Of Pretax Income		207.99%	15.42%
Net Earnings		-$105.9M	$175.0M
YoY Change		-266.04%	-178.27%
Net Earnings / Revenue		-21.04%	25.11%
Basic Earnings Per Share		-$0.54	$0.88
Diluted Earnings Per Share		-$0.54	$0.87
COMMON SHARES
Basic Shares Outstanding	195.4M shares	197.5M shares	198.8M shares
Diluted Shares Outstanding		200.8M shares	201.5M shares

Balance Sheet

Concept	2018 Q1	2017 Q4	2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments		$1.637B	$1.408B
YoY Change		82.56%	71.0%
Cash & Equivalents	$429.8M	$429.8M	$598.3M
Short-Term Investments		$1.218B	$809.3M
Other Short-Term Assets		$5.021M	$6.787M
YoY Change		-37.54%	-11.64%
Inventory		$107.5M	$153.6M
Prepaid Expenses		$108.1M	$106.0M
Receivables		$272.8M	$405.9M
Other Receivables		$0.00	$0.00
Total Short-Term Assets		$2.270B	$2.080B
YoY Change		39.81%	47.22%
LONG-TERM ASSETS
Property, Plant & Equipment		$268.4M	$258.0M
YoY Change		5.76%	-2.47%
Goodwill		$252.0M	$242.2M
YoY Change		12.84%	2.11%
Intangibles		$79.09M	$90.60M
YoY Change		-21.23%	-25.78%
Long-Term Investments		$211.9M	$212.5M
YoY Change		-40.78%	-24.78%
Other Assets		$12.28M	$12.43M
YoY Change		0.9%	-4.93%
Total Long-Term Assets		$839.3M	$950.2M
YoY Change		-26.3%	-4.5%
TOTAL ASSETS
Total Short-Term Assets		$2.270B	$2.080B
Total Long-Term Assets		$839.3M	$950.2M
Total Assets		$3.110B	$3.030B
YoY Change		12.56%	25.85%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable		$86.39M	$103.5M
YoY Change		-9.41%	0.35%
Accrued Expenses		$176.1M	$188.1M
YoY Change		20.7%	38.11%
Deferred Revenue
YoY Change
Short-Term Debt		$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities		$454.3M	$439.2M
YoY Change		21.91%	-3.54%
LONG-TERM LIABILITIES
Long-Term Debt		$362.6M	$359.2M
YoY Change
Other Long-Term Liabilities		$174.9M	$172.4M
YoY Change		-11.49%	-9.64%
Total Long-Term Liabilities		$537.5M	$531.6M
YoY Change		172.01%	178.62%
TOTAL LIABILITIES
Total Short-Term Liabilities		$454.3M	$439.2M
Total Long-Term Liabilities		$537.5M	$531.6M
Total Liabilities		$1.156B	$981.6M
YoY Change		23.78%	48.21%
SHAREHOLDERS EQUITY
Retained Earnings		$272.0M	$405.0M
YoY Change		18.12%	90.97%
Common Stock		$1.663B	$1.638B
YoY Change		2.74%	6.96%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$200.0M	$94.30M
YoY Change		-55.16%	-73.56%
Treasury Stock Shares		$5.800M	3.000M shares
Shareholders Equity	$1.954B	$1.954B	$2.049B
YoY Change
Total Liabilities & Shareholders Equity		$3.110B	$3.030B
YoY Change		12.56%	25.85%

Cashflow Statement

Concept	2017 Q4	2017 Q3
OPERATING ACTIVITIES
Net Income	-$105.9M	$175.0M
YoY Change	-266.04%	-178.27%
Depreciation, Depletion And Amortization	$26.60M	$27.70M
YoY Change	5.14%	-15.29%
Cash From Operating Activities	$309.8M	$230.3M
YoY Change	53.82%	21.27%
INVESTING ACTIVITIES
Capital Expenditures	-$27.20M	-$23.90M
YoY Change	38.07%	-9.13%
Acquisitions
YoY Change
Other Investing Activities	-$401.0M	$137.5M
YoY Change	72.47%	-327.27%
Cash From Investing Activities	-$428.4M	$113.7M
YoY Change	69.93%	-231.14%
FINANCING ACTIVITIES
Cash Dividend Paid	$13.80M	$13.90M
YoY Change	14.05%	13.93%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-62.20M	-70.50M
YoY Change	78.22%	70.29%
NET CHANGE
Cash From Operating Activities	309.8M	230.3M
Cash From Investing Activities	-428.4M	113.7M
Cash From Financing Activities	-62.20M	-70.50M
Net Change In Cash	-180.8M	273.5M
YoY Change	111.21%	342.56%
FREE CASH FLOW
Cash From Operating Activities	$309.8M	$230.3M
Capital Expenditures	-$27.20M	-$23.90M
Free Cash Flow	$337.0M	$254.2M
YoY Change	52.42%	17.58%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2016Q1	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	17.57
CY2016Q3	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	16.74
CY2017Q1	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	21.59
CY2017Q3	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	25.53
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CY2017Q2	dei	Entity Public Float EntityPublicFloat	5900000000
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CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	12443000	shares
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1507000	shares
CY2014Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8942000
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	2078980000
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	30418000
CY2014Q4	us-gaap	Extended Product Warranty Accrual ExtendedProductWarrantyAccrual	34197000
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	294256000
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	779000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	17.66
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	1121000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	10914000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1121000	shares
CY2015Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	6925000
CY2015Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	507620000
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	1965786000
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CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	264705000
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CY2015Q4	us-gaap	Assets Assets	2548674000
CY2015Q4	us-gaap	Goodwill Goodwill	488413000
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CY2015Q4	ter	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax	-622000
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CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	9546000	shares
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.125
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	199177000	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	926000	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	11.93
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	230292000
CY2016Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	7203000
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CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	-306698000
CY2016Q4	us-gaap	Extended Product Warranty Accrual ExtendedProductWarrantyAccrual	28200000
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CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
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CY2016Q4	us-gaap	Inventory Net InventoryNet	135958000
CY2016Q4	us-gaap	Land Land	16561000
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	192444000
CY2016Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1304711000
CY2016Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	433843000
CY2016Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	3032000
CY2016Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	31227000
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	31581000
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CY2016Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	414038000
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CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	446000000
CY2016Q4	ter	Prepaid Maintenance And Other Services PrepaidMaintenanceAndOtherServices	7676000
CY2016Q4	ter	Contract Manufacturer And Supplier Prepayments ContractManufacturerAndSupplierPrepayments	84473000
CY2016Q4	ter	Deferred Revenue And Customer Advances Undelivered Elements And Other DeferredRevenueAndCustomerAdvancesUndeliveredElementsAndOther	32938000
CY2016Q4	ter	Deferred Revenue And Customer Advances DeferredRevenueAndCustomerAdvances	107941000
CY2016Q4	ter	Deferred Revenue And Customer Advances Maintenance And Training DeferredRevenueAndCustomerAdvancesMaintenanceAndTraining	46803000
CY2016Q4	ter	Deferred Revenue And Customer Advances Current DeferredRevenueAndCustomerAdvancesCurrent	84478000
CY2016Q4	ter	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax	-778000
CY2016Q4	ter	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax	209000
CY2016Q4	ter	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	233000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	21.71
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	5800000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	195548000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	531000	shares
CY2017Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	233000	shares
CY2017Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	531000	shares
CY2017Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	13.92
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	8605000	shares
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.125
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	195548000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	2.95
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	531000	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.92
CY2017Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	2.95
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate	0.10	pure
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	24800000
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	272013000
CY2017Q4	us-gaap	Purchase Obligation PurchaseObligation	280400000
CY2017Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	10273000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	67723000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	14355000
CY2017Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	8200000
CY2017Q4	us-gaap	Liabilities Liabilities	1155899000
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3109545000
CY2017Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	102900000
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	762566000
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	141694000
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	29538000
CY2017Q4	us-gaap	Business Combination Contingent Consideration Liability Noncurrent BusinessCombinationContingentConsiderationLiabilityNoncurrent	20605000
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	18776000
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	86393000
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1953646000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	9201000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	17560000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	7331000
CY2017Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	1125000
CY2017Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	30127000
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	24444000
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1638413000
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	646045000
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	36263000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	11851000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	-337155000
CY2017Q4	us-gaap	Extended Product Warranty Accrual ExtendedProductWarrantyAccrual	24438000
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	6720000
CY2017Q4	us-gaap	Convertible Debt Noncurrent ConvertibleDebtNoncurrent	365987000
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	6582000
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2219000
CY2017Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	59055000
CY2017Q4	us-gaap	Accrued Income Taxes Noncurrent AccruedIncomeTaxesNoncurrent	148075000
CY2017Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	300000
CY2017Q4	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	271100000
CY2017Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	119776000
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	12293000
CY2017Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	24497000
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	59083000
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	7425000
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	454336000
CY2017Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	45102000
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	63919000
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	16120000
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	0
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	22602000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	6861000
CY2017Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	88539000
CY2017Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	647961000
CY2017Q4	us-gaap	Noncurrent Assets NoncurrentAssets	268447000
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	914492000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue	14831000
CY2017Q4	us-gaap	Assets Assets	3109545000
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	141000000
CY2017Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	1473905000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1349970000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1347979000
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	170763000
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	106844000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	27508000
CY2017Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	100000
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	325800000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	6151000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	2927000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	11249000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	25533000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	414038000
CY2017Q4	us-gaap	Goodwill Goodwill	252011000
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	1014577000
CY2017Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	25393000
CY2017Q4	us-gaap	Inventory Raw Materials Net Of Reserves InventoryRawMaterialsNetOfReserves	62668000
CY2017Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	19464000
CY2017Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	108117000
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	268447000
CY2017Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	9076000
CY2017Q4	us-gaap	Tax Credit Carryforward Amount TaxCreditCarryforwardAmount	123500000
CY2017Q4	us-gaap	Available For Sale Securities Current AvailableForSaleSecuritiesCurrent	1347979000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	13916000
CY2017Q4	us-gaap	Assets Current AssetsCurrent	2270281000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	13489000
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1209900000
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	3406000
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	71303000
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	713000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Compensated Absences DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences	4747000
CY2017Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	9016000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	48599000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	38644000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	1450475000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	1451326000
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1350896000
CY2017Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	98369000
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	429843000
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	5440000
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	7142000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	76083000
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	77306000
CY2017Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	84026000
CY2017Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	17491000
CY2017Q4	us-gaap	Derivative Assets Liabilities At Fair Value Net DerivativeAssetsLiabilitiesAtFairValueNet	-57000
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	42000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	29496000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3732000
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	79088000
CY2017Q4	us-gaap	Inventory Net InventoryNet	107525000
CY2017Q4	us-gaap	Land Land	16561000
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	272783000
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1470729000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	48796000
CY2017Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	40408000
CY2017Q4	us-gaap	Available For Sale Securities Noncurrent AvailableForSaleSecuritiesNoncurrent	125926000
CY2017Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	13522000
CY2017Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	17793000
CY2017Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	49540000
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	12275000
CY2017Q4	us-gaap	Other Prepaid Expense Current OtherPrepaidExpenseCurrent	12386000
CY2017Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	112151000
CY2017Q4	us-gaap	Prepaid Taxes PrepaidTaxes	5039000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	14831000
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	200000000
CY2017Q4	ter	Prepaid Maintenance And Other Services PrepaidMaintenanceAndOtherServices	8189000
CY2017Q4	ter	Contract Manufacturer And Supplier Prepayments ContractManufacturerAndSupplierPrepayments	82503000
CY2017Q4	ter	Deferred Revenue And Customer Advances Undelivered Elements And Other DeferredRevenueAndCustomerAdvancesUndeliveredElementsAndOther	32047000
CY2017Q4	ter	Deferred Revenue And Customer Advances DeferredRevenueAndCustomerAdvances	113741000
CY2017Q4	ter	Unrecognized Tax Benefits If Recognized Would Impact Deferred Taxes UnrecognizedTaxBenefitsIfRecognizedWouldImpactDeferredTaxes	11500000
CY2017Q4	ter	Deferred Revenue And Customer Advances Maintenance And Training DeferredRevenueAndCustomerAdvancesMaintenanceAndTraining	57256000
CY2017Q4	ter	Deferred Revenue And Customer Advances Current DeferredRevenueAndCustomerAdvancesCurrent	83614000
CY2017Q4	ter	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax	-932000
CY2017Q4	ter	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentTax	1815000
CY2017Q4	ter	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0
CY2015Q2	us-gaap	Debt Instrument Term DebtInstrumentTerm	P5Y
CY2015Q2	ter	Pledge Percentage Of Capital Stock PledgePercentageOfCapitalStock	0.65	pure
CY2016Q3	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	500000	shares
CY2015Q3	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	500000	shares
CY2016Q1	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	500000	shares
CY2017Q1	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	400000	shares
CY2017Q3	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	300000	shares
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.006	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.022	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.030	pure
CY2015	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.05
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	423076000
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y2M12D
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	213321000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	211544000	shares
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.004	pure
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	284000	shares
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y10M25D
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2015	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1777000	shares
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.24
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.98
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.010	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.138	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.007	pure
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	17.28
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	17.66
CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	518000	shares
CY2015	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	15600000	shares
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.184	pure
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Foreign EffectiveIncomeTaxRateReconciliationTaxCreditsForeign	0.027	pure
CY2015	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	41000	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	16.93
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	132000	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	1681000	shares
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P4Y2M12D
CY2015	us-gaap	Revenues Revenues	1639578000
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	89878000
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	299949000
CY2015	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	282741000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	10235000
CY2015	us-gaap	Gain Loss On Sale Of Equity Investments GainLossOnSaleOfEquityInvestments	5406000
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	4715000
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8528000
CY2015	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	1340566000
CY2015	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	299012000
CY2015	us-gaap	Product Warranty Accrual Additions From Business Acquisition ProductWarrantyAccrualAdditionsFromBusinessAcquisition	409000
CY2015	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	-3159000
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-3075000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	390000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	0
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	242969000
CY2015	us-gaap	Net Income Loss NetIncomeLoss	206477000
CY2015	us-gaap	Interest Paid InterestPaid	301000
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-15559000
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	57267000
CY2015	us-gaap	Extended Product Warranty Accrual Additions From Business Acquisition ExtendedProductWarrantyAccrualAdditionsFromBusinessAcquisition	870000
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	193644000
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30285000
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	6626000
CY2015	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	2253000
CY2015	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	10235000
CY2015	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1424002000
CY2015	us-gaap	Payments Of Dividends PaymentsOfDividends	50713000
CY2015	us-gaap	Payments For Proceeds From Life Insurance Policies PaymentsForProceedsFromLifeInsurancePolicies	-1098000
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-8759000
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-3779000
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	7214000
CY2015	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	11500000
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	35218000
CY2015	us-gaap	Gross Profit GrossProfit	915643000
CY2015	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	2500000
CY2015	us-gaap	Extended Product Warranty Accrual Warranties Issued ExtendedProductWarrantyAccrualWarrantiesIssued	17698000
CY2015	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-17732000
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	792000
CY2015	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	559000
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	34000
CY2015	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	11539000
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	4817000
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12833000
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-295000
CY2015	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-3034000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	196854000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	253124000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	56270000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	253124000
CY2015	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1700000
CY2015	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	4625000
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	30451000
CY2015	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	400000
CY2015	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	2489000
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-574000
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-7124000
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1211000
CY2015	us-gaap	Depreciation Depreciation	68181000
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	140773000
CY2015	us-gaap	Dividends Cash DividendsCash	50732000
CY2015	us-gaap	Extended Product Warranty Accrual Payments ExtendedProductWarrantyAccrualPayments	22741000
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	46647000
CY2015	us-gaap	Increase Decrease In Deferred Revenue And Customer Advances And Deposits IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits	17011000
CY2015	us-gaap	Interest Expense InterestExpense	1876000
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-113722000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	295000
CY2015	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	19530000
CY2015	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	1316131000
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	30451000
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	336000
CY2015	us-gaap	Adjustment For Amortization AdjustmentForAmortization	72592000
CY2015	us-gaap	Advertising Expense AdvertisingExpense	3300000
CY2015	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	21923000
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	16635000
CY2015	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	35707000
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	53771000
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	4715000
CY2015	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	200000
CY2015	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-12095000
CY2015	us-gaap	Inventory Write Down InventoryWriteDown	21332000
CY2015	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	292250000
CY2015	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	306313000
CY2015	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-5156000
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-338905000
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	15900000
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-169000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	704000
CY2015	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1667000
CY2015	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	5406000
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7255000
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	708000
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	69031000
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-29551000
CY2015	us-gaap	Cost Of Goods Sold CostOfGoodsSold	591772000
CY2015	us-gaap	Cost Of Revenue CostOfRevenue	723935000
CY2015	us-gaap	Cost Of Services CostOfServices	132163000
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1429000
CY2015	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-7761000
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	58448000
CY2015	us-gaap	Operating Expenses OperatingExpenses	672674000
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0
CY2015	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	360264000
CY2015	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	10806000
CY2015	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	5080000
CY2015	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	299949000
CY2015	ter	Number Of Customer Accounted For Ten Percent Or Greater Revenue NumberOfCustomerAccountedForTenPercentOrGreaterRevenue	1	Customer
CY2015	ter	Stock Issued During Period Shares Sale Of Stock And Exercise Of Stock Options StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions	200000	shares
CY2015	ter	Stock Repurchased During Period Average Price Per Share StockRepurchasedDuringPeriodAveragePricePerShare	19.20
CY2015	ter	Non Cash Charges Inventory Step Up NonCashChargesInventoryStepUp	1567000
CY2015	ter	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Shares Reserved In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalSharesReservedInPeriod	0	shares
CY2015	ter	Stock Issued During Period Value Share Based Compensation Net Of Shares Withheld For Taxes StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes	8933000
CY2015	ter	Book Value Of Internally Manufactured Test Systems Sold BookValueOfInternallyManufacturedTestSystemsSold	50700000
CY2015	ter	Deferred Income Tax Expense Benefit Net Of Adjustments DeferredIncomeTaxExpenseBenefitNetOfAdjustments	-7124000
CY2017	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 18px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>C.    RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS</b></font></p> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 6px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">On February 15, 2018, the FASB issued ASU 2018-02, <i>“Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.”</i> This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act enacted in December 2017. The guidance is effective for fiscal years beginning after December 15, 2018. Early adoption is permitted. Teradyne does not expect this ASU to have a material impact on its financial position, results of operations and statements of cash flows.</font></p> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 12px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">On March 10, 2017, the FASB issued ASU <font style="WHITE-SPACE: nowrap">2017-07,</font> <i>“Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost</i>.” This ASU provides guidance on presentation of net periodic pension cost and net periodic postretirement benefit cost. The new standard requires the service cost component to be presented in the same line item as other employee compensation costs arising from services rendered during the period. The other components of net benefit cost such as interest cost, amortization of prior service cost, and actuarial gains or losses, are required to be presented separately outside of income or loss from operations. The presentation of service cost should be applied retrospectively. The guidance is effective for fiscal years beginning after December 15, 2017. Early adoption is permitted. This guidance will impact the presentation of Teradyne’s consolidated financial statements. Upon adoption of the new standard, Teradyne will present interest cost, amortization of prior service cost, and actuarial gains or losses within other (income) expense, net.</font></p> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 12px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">On January 26, 2017, the FASB issued ASU <font style="WHITE-SPACE: nowrap">2017-04,</font> <i>“Intangibles—Goodwill and Other (Topic 350): Simplifying the Accounting for Goodwill Impairment.”</i> The new guidance removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. Goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain largely unchanged. Entities will continue to have the option to perform a qualitative assessment to determine if a quantitative impairment test is necessary. The same <font style="WHITE-SPACE: nowrap">one-step</font> impairment test will be applied to goodwill at all reporting units, even those with zero or negative carrying amounts. Entities will be required to disclose the amount of goodwill at reporting units with zero or negative carrying amounts. The revised guidance will be applied prospectively, and is effective in 2020. Early adoption is permitted for any impairment tests performed after January 1, 2017. Teradyne is currently evaluating the impact of this ASU on its financial position, results of operations and statements of cash flows.</font></p> <p style="MARGIN-BOTTOM: 0px; FONT-SIZE: 1px; MARGIN-TOP: 12px">  </p> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 0px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">In October 2016, the FASB issued ASU <font style="WHITE-SPACE: nowrap">2016-16,</font> <i>“Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory</i>.<i>”</i> Under current Generally Accepted Accounting Principles (“GAAP”), the tax effects of intra-entity asset transfers are deferred until the transferred asset is sold to a third party or otherwise recovered through use. The new guidance requires recognition of the tax expense from the sale of the asset in the seller’s tax jurisdiction when the transfer occurs, even though the <font style="WHITE-SPACE: nowrap">pre-tax</font> effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buyer’s jurisdiction would also be recognized at the time of the transfer. The new guidance does not apply to intra-entity transfers of inventory. The income tax consequences from the sale of inventory from one member of a consolidated entity to another will continue to be deferred until the inventory is sold to a third party. The new guidance will be effective in fiscal years beginning after December 15, 2017. Early adoption is permitted. The modified retrospective approach will be required for transition to the new guidance, with a cumulative-effect adjustment recorded in retained earnings as of the beginning of the period of adoption. Teradyne does not expect this ASU to have a material impact on its financial position, results of operations and statements of cash flows.</font></p> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 12px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">In February 2016, the FASB issued ASU <font style="WHITE-SPACE: nowrap">2016-02,</font> <i>“Leases (Topic 842).”</i> The guidance in this ASU supersedes the lease recognition requirements in ASC Topic 840, <i>“Leases.”</i> The new standard establishes a <font style="WHITE-SPACE: nowrap"><font style="WHITE-SPACE: nowrap">right-of-use</font></font> (“ROU”) model that requires a lessee to record an ROU asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the statements of operations. The new standard is effective for annual periods beginning after December 15, 2018 with early adoption permitted. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Teradyne is currently evaluating the impact of this ASU on its financial position and results of operations.</font></p> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 12px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">In January 2016, the FASB issued ASU <font style="WHITE-SPACE: nowrap">2016-01,</font> <i>“Financial Instruments—Overall (Subtopic <font style="WHITE-SPACE: nowrap">825-10):</font> Recognition and Measurement of Financial Assets and Financial Liabilities</i>.<i>”</i> This ASU provides guidance for the recognition, measurement, presentation, and disclosure of financial instruments. The new pronouncement revises accounting related to equity investments and the presentation of certain fair value changes for financial liabilities measured at fair value. Among other things, it amends the presentation and disclosure requirements of equity securities that do not result in consolidation and are not accounted for under the equity method. Changes in the fair value of these equity securities will be recognized directly in net income. This pronouncement is effective for fiscal years beginning after December 15, 2017. Teradyne is currently evaluating the impact of this ASU on its financial position and results of operations.</font></p> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 12px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">In May 2014, the FASB issued ASU <font style="WHITE-SPACE: nowrap">2014-09,</font> <i>“Revenue from Contracts with Customers (Topic 606),”</i> which will replace numerous requirements in U.S. GAAP, including industry-specific requirements, and provide companies with a single revenue recognition model for recognizing revenue from contracts with customers. The core principle of the new standard is that a company should recognize revenue to show the transfer of promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled to in exchange for those goods or services. In August 2015, FASB issued ASU <font style="WHITE-SPACE: nowrap">2015-14,</font> which deferred the effective date of the new revenue standard by one year. For Teradyne, the standard will be effective in the first quarter of 2018. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized in retained earnings at the date of initial application. Teradyne has selected the modified retrospective transition method. Teradyne has completed its preliminary assessment of the financial statement impact of the new standard and expects that the cumulative effect adjustment recognized to retained earnings on January 1, 2018 will be approximately $12 million, primarily as a result of recognizing revenues for software licenses at the time of delivery since the Vendor Specific Objective Evidence (“VSOE”) requirement for undelivered elements such as post-contract support is eliminated. Companies are allowed to use established or best estimate selling price for the undelivered element to allocate and defer the revenue. As a result, Teradyne will recognize as revenue upon delivery of the software and defer a portion of the sales price for the estimated selling price of post-contract support, compared to the current practice of recognizing the entire sales price ratably over the term of the post-contract support period due to the lack of VSOE. The $12 million adjustment to retained earnings reflects acceleration of approximately $16 million in revenues net of less than $1 million in cost of revenues and approximately $3 million of income tax expense. This preliminary assessment is based on a review of the types and number of revenue arrangements in place, including the review of individual customer contracts. Based on Teradyne’s preliminary assessment, Teradyne does not expect any major changes to be made to existing accounting systems or internal controls.</font></p> </div>
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Type DocumentType	10-K
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.28
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.008	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	0.017	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.016	pure
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000097210
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.12
CY2017	us-gaap	Nature Of Operations NatureOfOperations	<div> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 12px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>A.    THE COMPANY</b></font></p> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 6px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">Teradyne, Inc. (“Teradyne”) is a leading global supplier of automation equipment for test and industrial applications. Teradyne designs, develops, manufactures and sells automatic test systems used to test semiconductors, wireless products, data storage and complex electronics systems in the consumer electronics, wireless, automotive, industrial, computing, communications, and aerospace and defense industries. Teradyne’s industrial automation products include collaborative robots used by global manufacturing and light industrial customers to improve quality, increase manufacturing efficiency and decrease manufacturing costs. Teradyne’s automatic test equipment and industrial automation products and services include:</font></p> <p style="MARGIN-BOTTOM: 0px; FONT-SIZE: 6px; MARGIN-TOP: 0px">  </p> <table style="BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="PAGE-BREAK-INSIDE: avoid"> <td width="4%"><font size="1"> </font></td> <td valign="top" width="3%" align="left"><font style="FONT-FAMILY: Times New Roman" size="2">•</font></td> <td valign="top" width="1%"><font size="1"> </font></td> <td valign="top" align="left"> <p align="left"><font style="FONT-FAMILY: Times New Roman" size="2">semiconductor test (“Semiconductor Test”) systems;</font></p> </td> </tr> </table> <p style="MARGIN-BOTTOM: 0px; FONT-SIZE: 6px; MARGIN-TOP: 0px">  </p> <table style="BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="PAGE-BREAK-INSIDE: avoid"> <td width="4%"><font size="1"> </font></td> <td valign="top" width="3%" align="left"><font style="FONT-FAMILY: Times New Roman" size="2">•</font></td> <td valign="top" width="1%"><font size="1"> </font></td> <td valign="top" align="left"> <p align="left"><font style="FONT-FAMILY: Times New Roman" size="2">defense/aerospace (“Defense/Aerospace”) test instrumentation and systems, storage test (“Storage Test”) systems, and circuit-board test and inspection (“Production Board Test”) systems (collectively these products represent “System Test”);</font></p> </td> </tr> </table> <p style="MARGIN-BOTTOM: 0px; FONT-SIZE: 6px; MARGIN-TOP: 0px">  </p> <table style="BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="PAGE-BREAK-INSIDE: avoid"> <td width="4%"><font size="1"> </font></td> <td valign="top" width="3%" align="left"><font style="FONT-FAMILY: Times New Roman" size="2">•</font></td> <td valign="top" width="1%"><font size="1"> </font></td> <td valign="top" align="left"> <p align="left"><font style="FONT-FAMILY: Times New Roman" size="2">industrial automation (“Industrial Automation”) products; and</font></p> </td> </tr> </table> <p style="MARGIN-BOTTOM: 0px; FONT-SIZE: 6px; MARGIN-TOP: 0px">  </p> <table style="BORDER-COLLAPSE: collapse" cellspacing="0" cellpadding="0" width="100%" border="0"> <tr style="PAGE-BREAK-INSIDE: avoid"> <td width="4%"><font size="1"> </font></td> <td valign="top" width="3%" align="left"><font style="FONT-FAMILY: Times New Roman" size="2">•</font></td> <td valign="top" width="1%"><font size="1"> </font></td> <td valign="top" align="left"> <p align="left"><font style="FONT-FAMILY: Times New Roman" size="2">wireless test (“Wireless Test”) systems.</font></p> </td> </tr> </table> <p style="MARGIN-BOTTOM: 0px; MARGIN-TOP: 12px; TEXT-INDENT: 4%"> <font style="FONT-FAMILY: Times New Roman" size="2">On June 11, 2015, Teradyne acquired Universal Robots A/S (“Universal Robots”) for approximately $284 million of cash plus up to an additional $65 million of cash if certain performance targets are met extending through 2018. Universal Robots is the leading supplier of collaborative robots which are <font style="WHITE-SPACE: nowrap">low-cost,</font> <font style="WHITE-SPACE: nowrap"><font style="WHITE-SPACE: nowrap">easy-to-deploy</font></font> and <font style="WHITE-SPACE: nowrap"><font style="WHITE-SPACE: nowrap">simple-to-program</font></font> robots that work side by side with production workers. Universal Robots is a separate operating and reportable segment, Industrial Automation.</font></p> </div>
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	626495000
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	5000	shares
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y1M6D
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	13.60
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P7Y
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Number Of Shares Per Employee ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee	6000	shares
CY2017	dei	Trading Symbol TradingSymbol	TER
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	201641000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	198069000	shares
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	109000	shares
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Purchase Price Of Common Stock Percent SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent	0.85	pure
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	3.04
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	28.56
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y9M18D
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	3572000	shares
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.28
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	us-gaap	Defined Contribution Plan Employers Matching Contribution Annual Vesting Percentage DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage	0.25	pure
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.30
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.064	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.003	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.163	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003	pure
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017	us-gaap	Income Tax Holiday Termination Date IncomeTaxHolidayTerminationDate	December 31, 2020
CY2017	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	4	Segment
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	20.35
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	28.91
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	501000	shares
CY2017	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	34.30
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.509	pure
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Foreign EffectiveIncomeTaxRateReconciliationTaxCreditsForeign	0.022	pure
CY2017	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y3M19D
CY2017	dei	Entity Registrant Name EntityRegistrantName	TERADYNE, INC
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	us-gaap	Extended Product Warranty Accrual Period Increase Decrease ExtendedProductWarrantyAccrualPeriodIncreaseDecrease	24400000
CY2017	us-gaap	Incremental Common Shares Attributable To Call Options And Warrants IncrementalCommonSharesAttributableToCallOptionsAndWarrants	112000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Conversion Of Debt Securities IncrementalCommonSharesAttributableToConversionOfDebtSecurities	1298000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Equity Unit Purchase Agreements IncrementalCommonSharesAttributableToEquityUnitPurchaseAgreements	27000	shares
CY2017	us-gaap	Product Warranty Accrual Period Increase Decrease ProductWarrantyAccrualPeriodIncreaseDecrease	8200000
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	17.90
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	111000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	939000	shares
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P4Y1M6D
CY2017	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	15600000
CY2017	us-gaap	Revenues Revenues	2136606000
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	105375000
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	200304000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	12881000
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	39703000
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	10462000
CY2017	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	1784695000
CY2017	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	351911000
CY2017	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	-379000
CY2017	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	1050000
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1863000
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	297000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	0
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	530028000
CY2017	us-gaap	Net Income Loss NetIncomeLoss	257692000
CY2017	us-gaap	Interest Paid InterestPaid	6446000
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-44960000
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	80584000
CY2017	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	28668000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	3000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	64000
CY2017	us-gaap	Cumulative Effect On Retained Earnings Net Of Tax1 CumulativeEffectOnRetainedEarningsNetOfTax1	39081000
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	296682000
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	33982000
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	8208000
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	12881000
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1391917000
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	55447000
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	37840000
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1422000
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	17805000
CY2017	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	24800000
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	53775000
CY2017	us-gaap	Gross Profit GrossProfit	1223872000
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-2900000
CY2017	us-gaap	Finite Lived Intangible Assets Foreign Currency Translation Gain Loss FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss	-2205000
CY2017	us-gaap	Extended Product Warranty Accrual Warranties Issued ExtendedProductWarrantyAccrualWarrantiesIssued	20513000
CY2017	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	6624000
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	199000
CY2017	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	451000
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-707000
CY2017	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	14223000
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1758000
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	38990000
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-272000
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2254000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	447713000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	524412000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	76699000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	524412000
CY2017	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1100000
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	34097000
CY2017	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	300000
CY2017	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	7820000
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	43687000
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	37105000
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-106000
CY2017	us-gaap	Depreciation Depreciation	66122000
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	108075000
CY2017	us-gaap	Dividends Cash DividendsCash	55478000
CY2017	us-gaap	Extended Product Warranty Accrual Payments ExtendedProductWarrantyAccrualPayments	24275000
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	266720000
CY2017	us-gaap	Increase Decrease In Deferred Revenue And Customer Advances And Deposits IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits	4984000
CY2017	us-gaap	Interest Expense InterestExpense	21663000
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-262801000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	272000
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	162679000
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	64313000
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	229615000
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents Continuing Operations EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	3454000
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	24493000
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	527746000
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	34097000
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	204000
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	325000
CY2017	us-gaap	Adjustment For Amortization AdjustmentForAmortization	41953000
CY2017	us-gaap	Advertising Expense AdvertisingExpense	9100000
CY2017	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	23635000
CY2017	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	13318000
CY2017	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	100000
CY2017	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-5902000
CY2017	us-gaap	Inventory Write Down InventoryWriteDown	8844000
CY2017	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	5064000
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	713000
CY2017	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	305665000
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	348287000
CY2017	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	1200000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	3000
CY2017	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	173802000
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	19052000
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-245189000
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	18900000
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-154000
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	441000
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1903000
CY2017	us-gaap	Severance Costs1 SeveranceCosts1	1400000
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	8035000
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	10573000
CY2017	us-gaap	Unusual Or Infrequent Item Net Of Insurance Proceeds UnusualOrInfrequentItemNetOfInsuranceProceeds	-4309000
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	30530000
CY2017	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	2200000
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	121959000
CY2017	us-gaap	Cost Of Goods Sold CostOfGoodsSold	758548000
CY2017	us-gaap	Cost Of Revenue CostOfRevenue	912734000
CY2017	us-gaap	Cost Of Services CostOfServices	154186000
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2623000
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-6476000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	60000
CY2017	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	1050000
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	43574000
CY2017	us-gaap	Operating Expenses OperatingExpenses	693844000
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	701681000
CY2017	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	12847000
CY2017	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	9362000
CY2017	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	200304000
CY2017	ter	Contractual Interest Expense On Coupon ContractualInterestExpenseOnCoupon	5734000
CY2017	ter	Number Of Customer Accounted For Ten Percent Or Greater Revenue NumberOfCustomerAccountedForTenPercentOrGreaterRevenue	1	Customer
CY2017	ter	Stock Issued During Period Shares Sale Of Stock And Exercise Of Stock Options StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions	100000	shares
CY2017	ter	Savings Plan Maximum Percentage Of Employees Contribution Allowable SavingsPlanMaximumPercentageOfEmployeesContributionAllowable	0.20	pure
CY2017	ter	Warranty Period WarrantyPeriod	P1Y
CY2017	ter	Depreciation Period Over Life To Cost Of Revenues And Selling And Administrative Expenses DepreciationPeriodOverLifeToCostOfRevenuesAndSellingAndAdministrativeExpenses	P6Y
CY2017	ter	Maximum Shares Can Be Purchased Under Plan At Fair Market Value MaximumSharesCanBePurchasedUnderPlanAtFairMarketValue	25000
CY2017	ter	Lease Termination Month And Year LeaseTerminationMonthAndYear	2017-09
CY2017	ter	Share Based Compensation Arrangement By Share Based Payment Award Options Cancelled In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriodWeightedAverageExercisePrice	0
CY2017	ter	Maximum Employment Period Considered For Vesting Of Employers Contribution MaximumEmploymentPeriodConsideredForVestingOfEmployersContribution	P4Y
CY2017	ter	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Shares Reserved In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalSharesReservedInPeriod	0	shares
CY2017	ter	Stock Issued During Period Value Share Based Compensation Net Of Shares Withheld For Taxes StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes	11024000
CY2017	ter	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Transition Tax EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017TransitionTax	0.287	pure
CY2017	ter	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Deemed Repatriation Foreign Earnings Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingDeemedRepatriationForeignEarningsProvisionalIncomeTaxExpenseBenefit	161000000
CY2017	ter	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Remeasurement Of Deferred Tax Assets Liabilities Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingRemeasurementOfDeferredTaxAssetsLiabilitiesProvisionalIncomeTaxExpense	33600000
CY2017	ter	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Impact Of Correlative Adjustments Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingImpactOfCorrelativeAdjustmentsProvisionalIncomeTaxExpenseBenefit	10300000
CY2017	ter	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Increase Decrease Valuation Allowance TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncreaseDecreaseValuationAllowance	11300000
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.21
CY2017	ter	Book Value Of Internally Manufactured Test Systems Sold BookValueOfInternallyManufacturedTestSystemsSold	3600000
CY2017	ter	Deferred Income Tax Expense Benefit Net Of Adjustments DeferredIncomeTaxExpenseBenefitNetOfAdjustments	37105000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	-1.621	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.027	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Contingencies EffectiveIncomeTaxRateReconciliationTaxContingencies	-0.026	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.158	pure
CY2016	us-gaap	Income Tax Holiday Income Tax Benefits Per Share IncomeTaxHolidayIncomeTaxBenefitsPerShare	0.08
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	455197000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	2000	shares
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y10M25D
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	202578000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	202578000	shares
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.023	pure
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	233000	shares
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y2M12D
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.24
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.21
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	-0.023	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.780	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.005	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	-0.037	pure
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	17.80
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	18.95
CY2016	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	324000	shares
CY2016	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	6800000	shares
CY2016	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	19.87
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.211	pure
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Foreign EffectiveIncomeTaxRateReconciliationTaxCreditsForeign	-0.491	pure
CY2016	us-gaap	Extended Product Warranty Accrual Period Increase Decrease ExtendedProductWarrantyAccrualPeriodIncreaseDecrease	28200000
CY2016	us-gaap	Product Warranty Accrual Period Increase Decrease ProductWarrantyAccrualPeriodIncreaseDecrease	7200000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	17.36
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	130000	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	1471000	shares
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P3Y10M25D
CY2016	us-gaap	Revenues Revenues	1753250000
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	85272000
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	146331000
CY2016	us-gaap	Payments For Hedge Financing Activities PaymentsForHedgeFinancingActivities	100834000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	9398000
CY2016	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-11066000
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	6198000
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8752000
CY2016	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	100836000
CY2016	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	1453248000
CY2016	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	300002000
CY2016	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	-1354000
CY2016	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	11697000
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	2037000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	255000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	34000
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	-60015000
CY2016	us-gaap	Net Income Loss NetIncomeLoss	-43421000
CY2016	us-gaap	Interest Paid InterestPaid	446000
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-34263000
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-18325000
CY2016	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-10124000
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-55491000
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30745000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	9766000
CY2016	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	9398000
CY2016	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1656267000
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	48619000
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-13162000
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1354000
CY2016	us-gaap	Investment Income Interest InvestmentIncomeInterest	9296000
CY2016	us-gaap	Income Tax Reconciliation Tax Holidays IncomeTaxReconciliationTaxHolidays	17000000
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	40424000
CY2016	us-gaap	Gross Profit GrossProfit	959567000
CY2016	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	8000000
CY2016	us-gaap	Finite Lived Intangible Assets Foreign Currency Translation Gain Loss FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss	6939000
CY2016	us-gaap	Extended Product Warranty Accrual Warranties Issued ExtendedProductWarrantyAccrualWarrantiesIssued	19909000
CY2016	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	3203000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	187000
CY2016	us-gaap	Reclassification From Aoci Current Period Tax ReclassificationFromAociCurrentPeriodTax	445000
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	448000
CY2016	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	14291000
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-704000
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12070000
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-321000
CY2016	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	19194000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	285958000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-55060000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-341018000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-55060000
CY2016	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	1600000
CY2016	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	6087000
CY2016	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	67852000
CY2016	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt Subsequent Adjustments AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments	2017000
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	30750000
CY2016	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	500000
CY2016	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	15896000
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-51482000
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-62936000
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2214000
CY2016	us-gaap	Depreciation Depreciation	64782000
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	120009000
CY2016	us-gaap	Dividends Cash DividendsCash	48639000
CY2016	us-gaap	Extended Product Warranty Accrual Payments ExtendedProductWarrantyAccrualPayments	21733000
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-11639000
CY2016	us-gaap	Increase Decrease In Deferred Revenue And Customer Advances And Deposits IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits	-3634000
CY2016	us-gaap	Interest Expense InterestExpense	3637000
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-640462000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	262000
CY2016	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	20473000
CY2016	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	450800000
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	852794000
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	30750000
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	2295000
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	3532000
CY2016	us-gaap	Adjustment For Amortization AdjustmentForAmortization	55227000
CY2016	us-gaap	Advertising Expense AdvertisingExpense	6400000
CY2016	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	21998000
CY2016	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	688000
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	7750000
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	41579000
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	51297000
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	6198000
CY2016	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	100000
CY2016	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-6044000
CY2016	us-gaap	Inventory Write Down InventoryWriteDown	17493000
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	-59000
CY2016	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	83339000
CY2016	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	18434000
CY2016	us-gaap	Interest Expense Debt InterestExpenseDebt	991000
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	228444000
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	18800000
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-190000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	683000
CY2016	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	5051000
CY2016	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1004000
CY2016	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	291025000
CY2016	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	315682000
CY2016	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	300000
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	923000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3729000
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1960000
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	52648000
CY2016	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	2500000
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	43179000
CY2016	us-gaap	Cost Of Goods Sold CostOfGoodsSold	659097000
CY2016	us-gaap	Cost Of Revenue CostOfRevenue	793683000
CY2016	us-gaap	Cost Of Services CostOfServices	134586000
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1968000
CY2016	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-9240000
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements	15000000
CY2016	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	254946000
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	6820000
CY2016	us-gaap	Operating Expenses OperatingExpenses	1019582000
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	243232000
CY2016	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	67852000
CY2016	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	12659000
CY2016	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	21942000
CY2016	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	146331000
CY2016	ter	Contractual Interest Expense On Coupon ContractualInterestExpenseOnCoupon	303000
CY2016	ter	Number Of Customer Accounted For Ten Percent Or Greater Revenue NumberOfCustomerAccountedForTenPercentOrGreaterRevenue	1	Customer
CY2016	ter	Stock Repurchased During Period Average Price Per Share StockRepurchasedDuringPeriodAveragePricePerShare	21.39
CY2016	ter	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Shares Reserved In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalSharesReservedInPeriod	0	shares
CY2016	ter	Stock Issued During Period Value Share Based Compensation Net Of Shares Withheld For Taxes StockIssuedDuringPeriodValueShareBasedCompensationNetOfSharesWithheldForTaxes	10665000
CY2016	ter	Book Value Of Internally Manufactured Test Systems Sold BookValueOfInternallyManufacturedTestSystemsSold	11400000
CY2016	ter	Deferred Income Tax Expense Benefit Net Of Adjustments DeferredIncomeTaxExpenseBenefitNetOfAdjustments	-62936000
CY2016	ter	Adjustments To Additional Paid In Capital Convertible Debt Hedges AdjustmentsToAdditionalPaidInCapitalConvertibleDebtHedges	100834000
CY2016	ter	Effective Income Tax Rate Reconciliation Inventory Cost Capitalization EffectiveIncomeTaxRateReconciliationInventoryCostCapitalization	0.018	pure
CY2015Q1	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	5400000
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	59172000
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	66345000
CY2016Q4	us-gaap	Investment Income Interest InvestmentIncomeInterest	3095000
CY2016Q4	us-gaap	Gross Profit GrossProfit	219006000
CY2016Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1779000
CY2016Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	58884000
CY2016Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7461000
CY2016Q4	us-gaap	Interest Expense InterestExpense	1604000
CY2016Q4	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	2000000
CY2016Q4	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	303667000
CY2016Q4	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	76322000
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2016Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.06
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2016Q4	us-gaap	Revenues Revenues	379989000
CY2016Q4	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	70052000
CY2016Q4	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	76289000
CY2016Q4	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7923000
CY2016Q4	us-gaap	Cost Of Goods Sold CostOfGoodsSold	127481000
CY2016Q4	us-gaap	Cost Of Revenue CostOfRevenue	160983000
CY2016Q4	us-gaap	Cost Of Services CostOfServices	33502000
CY2016Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2016Q4	us-gaap	Operating Expenses OperatingExpenses	159834000
CY2016Q4	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	5570000
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2016Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.06
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.32
CY2016Q4	us-gaap	Revenues Revenues	410475000
CY2016Q4	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-700000
CY2016Q4	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	334610000
CY2016Q4	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	75865000
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	56501000
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	63794000
CY2016Q4	us-gaap	Investment Income Interest InvestmentIncomeInterest	2892000
CY2016Q4	us-gaap	Gross Profit GrossProfit	227359000
CY2016Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	921000
CY2016Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	59681000
CY2016Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-4113000
CY2016Q4	us-gaap	Interest Expense InterestExpense	633000
CY2016Q4	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	71400000
CY2016Q4	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	78794000
CY2016Q4	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	8487000
CY2016Q4	us-gaap	Cost Of Goods Sold CostOfGoodsSold	148266000
CY2016Q4	us-gaap	Cost Of Revenue CostOfRevenue	183116000
CY2016Q4	us-gaap	Cost Of Services CostOfServices	34850000
CY2016Q4	us-gaap	Operating Expenses OperatingExpenses	170858000
CY2016Q4	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	12177000
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2017Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.07
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2017Q3	us-gaap	Revenues Revenues	696901000
CY2017Q3	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	2500000
CY2017Q3	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	610356000
CY2017Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	86545000
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	209906000
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	174976000
CY2017Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	3292000
CY2017Q3	us-gaap	Gross Profit GrossProfit	391219000
CY2017Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-812000
CY2017Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	206877000
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31901000
CY2017Q3	us-gaap	Interest Expense InterestExpense	5509000
CY2017Q3	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	81728000
CY2017Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	89131000
CY2017Q3	us-gaap	Severance Costs1 SeveranceCosts1	800000
CY2017Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	8166000
CY2017Q3	us-gaap	Cost Of Goods Sold CostOfGoodsSold	267171000
CY2017Q3	us-gaap	Cost Of Revenue CostOfRevenue	305682000
CY2017Q3	us-gaap	Cost Of Services CostOfServices	38511000
CY2017Q3	us-gaap	Operating Expenses OperatingExpenses	181313000
CY2017Q3	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	2288000
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2017Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.07
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2017Q4	us-gaap	Revenues Revenues	503378000
CY2017Q4	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	412854000
CY2017Q4	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	90524000
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	128731000
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	103420000
CY2017Q4	us-gaap	Investment Income Interest InvestmentIncomeInterest	4517000
CY2017Q4	us-gaap	Gross Profit GrossProfit	294786000
CY2017Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-439000
CY2017Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	127437000
CY2017Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	24017000
CY2017Q4	us-gaap	Interest Expense InterestExpense	5372000
CY2017Q4	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	77190000
CY2017Q4	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	86244000
CY2017Q4	us-gaap	Severance Costs1 SeveranceCosts1	600000
CY2017Q4	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7028000
CY2017Q4	us-gaap	Cost Of Goods Sold CostOfGoodsSold	169744000
CY2017Q4	us-gaap	Cost Of Revenue CostOfRevenue	208592000
CY2017Q4	us-gaap	Cost Of Services CostOfServices	38848000
CY2017Q4	us-gaap	Operating Expenses OperatingExpenses	166055000
CY2017Q4	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	-4407000
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.10
CY2016Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.06
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.10
CY2016Q3	us-gaap	Revenues Revenues	531792000
CY2016Q3	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	700000
CY2016Q3	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	456832000
CY2016Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	74960000
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-231801000
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	-223546000
CY2016Q3	us-gaap	Investment Income Interest InvestmentIncomeInterest	1666000
CY2016Q3	us-gaap	Gross Profit GrossProfit	282870000
CY2016Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	9000
CY2016Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-230817000
CY2016Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-7271000
CY2016Q3	us-gaap	Interest Expense InterestExpense	691000
CY2016Q3	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	76109000
CY2016Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	81425000
CY2016Q3	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	83339000
CY2016Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	16244000
CY2016Q3	us-gaap	Cost Of Goods Sold CostOfGoodsSold	215795000
CY2016Q3	us-gaap	Cost Of Revenue CostOfRevenue	248922000
CY2016Q3	us-gaap	Cost Of Services CostOfServices	33127000
CY2016Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	254946000
CY2016Q3	us-gaap	Operating Expenses OperatingExpenses	514671000
CY2016Q3	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	2608000
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.54
CY2017Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.07
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.54
CY2017Q4	us-gaap	Revenues Revenues	479415000
CY2017Q4	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	3800000
CY2017Q4	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	388282000
CY2017Q4	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	91133000
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	98011000
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	-105923000
CY2017Q4	us-gaap	Investment Income Interest InvestmentIncomeInterest	6476000
CY2017Q4	us-gaap	Gross Profit GrossProfit	272935000
CY2017Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1023000
CY2017Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	98084000
CY2017Q4	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	1100000
CY2017Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	204007000
CY2017Q4	us-gaap	Interest Expense InterestExpense	5380000
CY2017Q4	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	70564000
CY2017Q4	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	88006000
CY2017Q4	us-gaap	Severance Costs1 SeveranceCosts1	1800000
CY2017Q4	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7384000
CY2017Q4	us-gaap	Cost Of Goods Sold CostOfGoodsSold	166667000
CY2017Q4	us-gaap	Cost Of Revenue CostOfRevenue	206480000
CY2017Q4	us-gaap	Cost Of Services CostOfServices	39813000
CY2017Q4	us-gaap	Operating Expenses OperatingExpenses	174924000
CY2017Q4	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	8970000
CY2017Q4	ter	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	186000000
CY2013Q4	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	34200000
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2017Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.07
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2017Q2	us-gaap	Revenues Revenues	456913000
CY2017Q2	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	373204000
CY2017Q2	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	83709000
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	93382000
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	85221000
CY2017Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	3520000
CY2017Q2	us-gaap	Gross Profit GrossProfit	264933000
CY2017Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	516000
CY2017Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	92016000
CY2017Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6795000
CY2017Q2	us-gaap	Interest Expense InterestExpense	5402000
CY2017Q2	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	76182000
CY2017Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	84906000
CY2017Q2	us-gaap	Severance Costs1 SeveranceCosts1	600000
CY2017Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7952000
CY2017Q2	us-gaap	Cost Of Goods Sold CostOfGoodsSold	154966000
CY2017Q2	us-gaap	Cost Of Revenue CostOfRevenue	191980000
CY2017Q2	us-gaap	Cost Of Services CostOfServices	37014000
CY2017Q2	us-gaap	Operating Expenses OperatingExpenses	171551000
CY2017Q2	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	2511000
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2016Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.06
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.24
CY2016Q2	us-gaap	Revenues Revenues	430994000
CY2016Q2	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	1200000
CY2016Q2	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	358139000
CY2016Q2	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	72855000
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	56113000
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	49986000
CY2016Q2	us-gaap	Investment Income Interest InvestmentIncomeInterest	1642000
CY2016Q2	us-gaap	Gross Profit GrossProfit	230332000
CY2016Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	147000
CY2016Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	57192000
CY2016Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7206000
CY2016Q2	us-gaap	Interest Expense InterestExpense	710000
CY2016Q2	us-gaap	Research And Development Expense Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	73464000
CY2016Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	79174000
CY2016Q2	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	19994000
CY2016Q2	us-gaap	Cost Of Goods Sold CostOfGoodsSold	167555000
CY2016Q2	us-gaap	Cost Of Revenue CostOfRevenue	200662000
CY2016Q2	us-gaap	Cost Of Services CostOfServices	33107000
CY2016Q2	us-gaap	Operating Expenses OperatingExpenses	174219000
CY2016Q2	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	1587000

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$TER
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2018 Q1 Form 10-K Financial Statement

#000119312518066579 Filed on March 01, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TER TERADYNE, INC Stock $ter

2018 Q1 Form 10-K Financial Statement

#000119312518066579 Filed on March 01, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TER
TERADYNE, INC Stock $ter