$JNPR
JUNIPER NETWORKS INC Stock $jnpr

$jnpr Overview Financials Valuation SEC Filings Company Website

2010 Q4 Form 10-Q Financial Statement

#000095012310101603 Filed on November 05, 2010

Income Statement

Concept	2010 Q4	2010 Q3	2009 Q3
Revenue	$1.190B	$1.012B	$823.9M
YoY Change	26.39%	22.88%
Cost Of Revenue	$398.0M	$334.6M	$280.6M
YoY Change	28.26%	19.24%
Gross Profit	$792.0M	$677.8M	$543.3M
YoY Change	25.48%	24.76%
Gross Profit Margin	66.55%	66.95%	65.94%
Selling, General & Admin	$302.8M	$248.5M	$223.3M
YoY Change	19.92%	11.29%
% of Gross Profit	38.23%	36.66%	41.1%
Research & Development	$254.9M	$231.2M	$185.2M
YoY Change	36.16%	24.84%
% of Gross Profit	32.18%	34.11%	34.09%
Depreciation & Amortization
YoY Change
% of Gross Profit
Operating Expenses	$565.2M	$482.3M	$415.3M
YoY Change	-9.63%	16.13%
Operating Profit	$226.8M	$195.5M	$128.0M
YoY Change	3810.34%	52.73%
Interest Expense		$2.600M
YoY Change
% of Operating Profit		1.33%
Other Income/Expense, Net	$4.800M	$200.0K	$100.0K
YoY Change		100.0%
Pretax Income	$231.6M	$195.7M	$129.7M
YoY Change	5838.46%	50.89%
Income Tax	$41.50M	$61.40M	$45.90M
% Of Pretax Income	17.92%	31.37%	35.39%
Net Earnings	$190.2M	$134.5M	$83.80M
YoY Change	730.57%	60.5%
Net Earnings / Revenue	15.98%	13.29%	10.17%
Basic Earnings Per Share	$0.36	$0.26	$0.16
Diluted Earnings Per Share	$0.35	$0.25	$0.16
COMMON SHARES
Basic Shares Outstanding	523.2M shares	520.6M shares	523.9M shares
Diluted Shares Outstanding		534.9M shares	538.1M shares

Balance Sheet

Concept	2010 Q4	2010 Q3	2009 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.812B	$1.461B	$1.619B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory	$21.60M
Prepaid Expenses
Receivables	$596.6M	$474.0M
Other Receivables
Total Short-Term Assets	$3.214B	$2.867B
YoY Change	11.65%
LONG-TERM ASSETS
Property, Plant & Equipment	$493.9M	$484.8M
YoY Change	8.39%
Goodwill	$3.928B	$3.760B
YoY Change	7.36%
Intangibles	$121.8M	$47.63M
YoY Change	780.46%
Long-Term Investments		$700.0K	$1.700M
YoY Change		-58.82%
Other Assets	$55.47M	$53.91M
YoY Change	56.57%
Total Long-Term Assets	$5.253B	$5.024B
YoY Change	11.51%
TOTAL ASSETS
Total Short-Term Assets	$3.214B	$2.867B
Total Long-Term Assets	$5.253B	$5.024B
Total Assets	$8.468B	$7.891B
YoY Change	11.56%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$292.3M	$251.4M
YoY Change	20.48%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.472B	$1.241B
YoY Change	6.99%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00
YoY Change
Other Long-Term Liabilities	$59.09M	$44.33M
YoY Change	57.44%
Total Long-Term Liabilities	$59.09M	$44.33M
YoY Change	57.44%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.472B	$1.241B
Total Long-Term Liabilities	$59.09M	$44.33M
Total Liabilities	$1.531B	$1.285B
YoY Change	8.33%
SHAREHOLDERS EQUITY
Retained Earnings	-$3.108B	-$3.138B
YoY Change	-3.96%
Common Stock	$9.718B	$9.450B
YoY Change	7.26%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$6.608B	$6.316B
YoY Change
Total Liabilities & Shareholders Equity	$8.468B	$7.891B
YoY Change	11.56%

Cashflow Statement

Concept	2010 Q4	2010 Q3	2009 Q3
OPERATING ACTIVITIES
Net Income	$190.2M	$134.5M	$83.80M
YoY Change	730.57%	60.5%
Depreciation, Depletion And Amortization
YoY Change
Cash From Operating Activities
YoY Change
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities
YoY Change
Cash From Investing Activities
YoY Change
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities
YoY Change
NET CHANGE
Cash From Operating Activities
Cash From Investing Activities
Cash From Financing Activities
Net Change In Cash
YoY Change
FREE CASH FLOW
Cash From Operating Activities
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2009Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1121000	USD
CY2010Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-206000	USD
CY2009Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	571652000	USD
CY2010Q3	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	594437000	USD
	us-gaap	Trading Securities Unrealized Holding Gain TradingSecuritiesUnrealizedHoldingGain	2500000	USD
	us-gaap	Finite Lived Intangible Assets Future Amortization Expense FiniteLivedIntangibleAssetsFutureAmortizationExpense	47600000	USD
CY2010Q3	jnpr	Unrecognized Compensation Cost Related To Unvested Restricted Stock Units UnrecognizedCompensationCostRelatedToUnvestedRestrictedStockUnits	130000000	USD
CY2009Q4	us-gaap	Minority Interest MinorityInterest	2629000	USD
CY2010Q3	us-gaap	Minority Interest MinorityInterest	750000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-84813000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	16900000	USD
CY2009Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	13834000	USD
CY2010Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	47629000	USD
CY2010Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	917000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3258000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	9259000	USD
CY2009Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1330000	USD
CY2009Q3	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	634074000	USD
CY2010Q3	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	801183000	USD
	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	2296442000	USD
	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	1828896000	USD
	jnpr	Thereafter Thereafter	7700000	USD
	jnpr	Share Based Compensation Arrangement By Share Based Payment Award Options Other Share Increase Decrease During Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherShareIncreaseDecreaseDuringPeriodWeightedAverageExercisePrice	21.64
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	21.56
CY2010Q3	us-gaap	Assets Current AssetsCurrent	2866811000	USD
CY2009Q4	us-gaap	Assets Current AssetsCurrent	2878959000	USD
CY2010Q3	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Amount BusinessAcquisitionPurchasePriceAllocationGoodwillAmount	101000000	USD
CY2009Q1	us-gaap	Unrecognized Tax Benefits Increases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities	54100000	USD
CY2009Q2	us-gaap	Unrecognized Tax Benefits Increases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities	52100000	USD
CY2010Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.00001	USD
CY2009Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.00001	USD
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Amendment Flag AmendmentFlag	false
CY2006Q3	us-gaap	Loss Contingency New Claims Filed Number LossContingencyNewClaimsFiledNumber	2	pure
CY2009Q3	jnpr	Income Tax Charges IncomeTaxCharges	4600000	USD
	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	662913000	USD
CY2010Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	231151000	USD
	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	554498000	USD
CY2009Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	37531000	USD
CY2010Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	44332000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1361510000	USD
	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1164833000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableIntrinsicValue	386800000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	700000	shares
CY2009Q1	jnpr	Income Tax Charges IncomeTaxCharges	61800000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	5800000	USD
CY2009Q3	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	185204000	USD
	jnpr	Vested And Expected To Vest Restricted Stock Units And Performance Share Awards Weighted Average Remaining Contractual Term VestedAndExpectedToVestRestrictedStockUnitsAndPerformanceShareAwardsWeightedAverageRemainingContractualTerm	1.7
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-836000	USD
	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-21790000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-117979000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-106979000	USD
	us-gaap	Restructuring Reserve Settled With Cash RestructuringReserveSettledWithCash	-6000000	USD
CY2009Q3	us-gaap	Restructuring Reserve Settled With Cash RestructuringReserveSettledWithCash	-2800000	USD
CY2010Q3	us-gaap	Restructuring Reserve Settled With Cash RestructuringReserveSettledWithCash	-1400000	USD
	us-gaap	Restructuring Reserve Settled With Cash RestructuringReserveSettledWithCash	-7200000	USD
CY2009Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	35425000	USD
CY2010Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	53908000	USD
	jnpr	Employee Contribution Matched In Percent EmployeeContributionMatchedInPercent	0.25	pure
CY2010Q3	us-gaap	Litigation Reserve Current LitigationReserveCurrent	0	USD
CY2009Q4	us-gaap	Litigation Reserve Current LitigationReserveCurrent	169330000	USD
	jnpr	Weighted Average Period Of Unrecognized Compensation Cost Related To Unvested Restricted Stock Units In Years WeightedAveragePeriodOfUnrecognizedCompensationCostRelatedToUnvestedRestrictedStockUnitsInYears	2.4	pure
CY2010Q3	jnpr	Customers Accounting For Ten Percent Or More Of Companys Net Revenues CustomersAccountingForTenPercentOrMoreOfCompanysNetRevenues	0	pure
	jnpr	Customers Accounting For Ten Percent Or More Of Companys Net Revenues CustomersAccountingForTenPercentOrMoreOfCompanysNetRevenues	0	pure
	jnpr	Share Based Compensation Arrangement By Share Based Payment Award Options Grant In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantInPeriodWeightedAverageExercisePrice	28.71
	jnpr	Performance Share Awards Weighted Average Fair Value Per Share PerformanceShareAwardsWeightedAverageFairValuePerShare	28.73
CY2009Q3	jnpr	Performance Share Awards Weighted Average Fair Value Per Share PerformanceShareAwardsWeightedAverageFairValuePerShare	26.3
	jnpr	Performance Share Awards Weighted Average Fair Value Per Share PerformanceShareAwardsWeightedAverageFairValuePerShare	17.18
CY2010Q3	jnpr	Performance Share Awards Weighted Average Fair Value Per Share PerformanceShareAwardsWeightedAverageFairValuePerShare	27.76
CY2010Q3	us-gaap	Standard Product Warranty Accrual Current StandardProductWarrantyAccrualCurrent	36360000	USD
CY2009Q4	us-gaap	Standard Product Warranty Accrual Current StandardProductWarrantyAccrualCurrent	38199000	USD
CY2010Q3	us-gaap	Business Acquisition Cost Of Acquired Entity Other Noncash Consideration BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsideration	8100000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	7700000	USD
CY2009Q4	jnpr	Trading Securities Amortized Cost TradingSecuritiesAmortizedCost	10100000	USD
CY2010Q3	jnpr	Trading Securities Amortized Cost TradingSecuritiesAmortizedCost	11300000	USD
CY2009Q3	jnpr	Investment In Publicly Held Company InvestmentInPubliclyHeldCompany	0	USD
	jnpr	Investment In Publicly Held Company InvestmentInPubliclyHeldCompany	0	USD
CY2010Q3	jnpr	Five Year Data Center Hosting Agreement Amount FiveYearDataCenterHostingAgreementAmount	14100000	USD
CY2009Q4	us-gaap	Trading Securities Fair Value Disclosure TradingSecuritiesFairValueDisclosure	10100000	USD
CY2010Q3	us-gaap	Trading Securities Fair Value Disclosure TradingSecuritiesFairValueDisclosure	13800000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	133333000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2010Q3	jnpr	Maximum Additional Shares Expire Unexercised Under1996 And2000 Plan MaximumAdditionalSharesExpireUnexercisedUnder1996And2000Plan	75000000	shares
CY2010Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	21000000	USD
CY2010Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	20800000	USD
CY2009Q1	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	19300000	USD
CY2009Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	19800000	USD
CY2009Q3	jnpr	Interest Income And Expense Net InterestIncomeAndExpenseNet	1600000	USD
CY2010Q3	jnpr	Interest Income And Expense Net InterestIncomeAndExpenseNet	300000	USD
	jnpr	Interest Income And Expense Net InterestIncomeAndExpenseNet	5200000	USD
	jnpr	Interest Income And Expense Net InterestIncomeAndExpenseNet	1800000	USD
CY2010Q2	us-gaap	Business Acquisition Cost Of Acquired Entity Other Noncash Consideration BusinessAcquisitionCostOfAcquiredEntityOtherNoncashConsideration	10700000	USD
CY2009Q3	us-gaap	Equity Method Investments EquityMethodInvestments	1700000	USD
CY2010Q3	us-gaap	Equity Method Investments EquityMethodInvestments	700000	USD
	jnpr	Restricted Stock Units Weighted Average Fair Value Per Share RestrictedStockUnitsWeightedAverageFairValuePerShare	29.27
	jnpr	Restricted Stock Units Weighted Average Fair Value Per Share RestrictedStockUnitsWeightedAverageFairValuePerShare	16.09
CY2009Q3	jnpr	Restricted Stock Units Weighted Average Fair Value Per Share RestrictedStockUnitsWeightedAverageFairValuePerShare	25.86
CY2010Q3	jnpr	Restricted Stock Units Weighted Average Fair Value Per Share RestrictedStockUnitsWeightedAverageFairValuePerShare	28.18
CY2010Q3	us-gaap	Acquired Finite Lived Intangible Asset Amount AcquiredFiniteLivedIntangibleAssetAmount	38800000	USD
CY2009Q4	us-gaap	Acquired Finite Lived Intangible Asset Amount AcquiredFiniteLivedIntangibleAssetAmount	0	USD
	us-gaap	Operating Expenses OperatingExpenses	1408960000	USD
	us-gaap	Operating Expenses OperatingExpenses	1247114000	USD
CY2009Q3	us-gaap	Operating Expenses OperatingExpenses	415328000	USD
CY2010Q3	us-gaap	Operating Expenses OperatingExpenses	482251000	USD
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	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
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	us-gaap	Restructuring Reserve Period Expense RestructuringReservePeriodExpense	8600000	USD
CY2009Q3	us-gaap	Restructuring Reserve Period Expense RestructuringReservePeriodExpense	4500000	USD
	us-gaap	Restructuring Reserve Period Expense RestructuringReservePeriodExpense	16300000	USD
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	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	33400000	USD
CY2009Q3	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	14700000	USD
CY2010Q3	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	13700000	USD
	us-gaap	Product Warranty Accrual Warranties Issued ProductWarrantyAccrualWarrantiesIssued	37900000	USD
CY2009Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	189838000	USD
	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	606883000	USD
	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	545562000	USD
CY2010Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	211224000	USD
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CY2010Q3	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	181955000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Net Current DeferredTaxAssetsNetCurrent	196318000	USD
CY2009Q4	jnpr	Accumulated Impairment Losses AccumulatedImpairmentLosses	1280000000	USD
CY2010Q3	jnpr	Accumulated Impairment Losses AccumulatedImpairmentLosses	1280000000	USD
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.66
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	20.84
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	5289000	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	5288000	USD
	jnpr	Amortization Of Purchased Intangible Assets AmortizationOfPurchasedIntangibleAssets	13400000	USD
	jnpr	Amortization Of Purchased Intangible Assets AmortizationOfPurchasedIntangibleAssets	5000000	USD
CY2009Q3	jnpr	Amortization Of Purchased Intangible Assets AmortizationOfPurchasedIntangibleAssets	2700000	USD
CY2010Q3	jnpr	Amortization Of Purchased Intangible Assets AmortizationOfPurchasedIntangibleAssets	2400000	USD
CY2010Q3	us-gaap	Business Acquisition Purchase Price Allocation Assets Acquired Liabilities Assumed Net BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet	-1400000	USD
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CY2009Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	4000000	USD
CY2010Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	15000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	388698000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	241481000	USD
CY2009Q4	us-gaap	Deferred Compensation Liability Current DeferredCompensationLiabilityCurrent	4700000	USD
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CY2010Q3	jnpr	Investment In Privately Held Companies InvestmentInPrivatelyHeldCompanies	4600000	USD
	jnpr	Investment In Privately Held Companies InvestmentInPrivatelyHeldCompanies	9800000	USD
	jnpr	Investment In Privately Held Companies InvestmentInPrivatelyHeldCompanies	6300000	USD
CY2010Q3	jnpr	Increase In Restricted Cash IncreaseInRestrictedCash	69600000	USD
	jnpr	Increase In Restricted Cash IncreaseInRestrictedCash	150100000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	10555000	USD
CY2010Q3	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	0	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2009Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2010Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm	4.2
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	536492000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	441300000	USD
	jnpr	Maturity Period Of Non Designated Hedges Derivatives MaturityPeriodOfNonDesignatedHedgesDerivatives	approximately two months
CY2010Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	251431000	USD
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CY2010Q3	jnpr	Increase In Revenue Due To Products Booked And Shipped IncreaseInRevenueDueToProductsBookedAndShipped	31000000	USD
	jnpr	Increase In Revenue Due To Products Booked And Shipped IncreaseInRevenueDueToProductsBookedAndShipped	91000000	USD
CY2009Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-3236525000	USD
CY2010Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-3137836000	USD
CY2009Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.18
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.82
CY2010Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2010Q3	us-gaap	Stockholders Equity StockholdersEquity	6316149000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	5822136000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	137481000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	113210000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-16906000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	3784000	USD
CY2010Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	278800000	USD
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	505300000	USD
CY2010Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	29500000	USD
	us-gaap	Future Amortization Expense Year Two FutureAmortizationExpenseYearTwo	10400000	USD
	jnpr	Share Based Payroll Tax Expense ShareBasedPayrollTaxExpense	1500000	USD
	jnpr	Share Based Payroll Tax Expense ShareBasedPayrollTaxExpense	3800000	USD
CY2010Q3	jnpr	Share Based Payroll Tax Expense ShareBasedPayrollTaxExpense	500000	USD
CY2009Q3	jnpr	Share Based Payroll Tax Expense ShareBasedPayrollTaxExpense	800000	USD
CY2010Q3	jnpr	Amount Of Restricted Investments Measured At Fair Value Included In Balance Of Money Market Funds AmountOfRestrictedInvestmentsMeasuredAtFairValueIncludedInBalanceOfMoneyMarketFunds	50000000	USD
CY2010Q3	jnpr	Common Stock For Future Issuance Under Its Stock Award CommonStockForFutureIssuanceUnderItsStockAward	112600000	shares
CY2009Q4	us-gaap	Goodwill Goodwill	3658602000	USD
CY2010Q3	us-gaap	Goodwill Goodwill	3759631000	USD
CY2009Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	45902000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	117225000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	214018000	USD
CY2010Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	61404000	USD
CY2010Q3	us-gaap	Restricted Cash And Investments Noncurrent RestrictedCashAndInvestmentsNoncurrent	79080000	USD
CY2009Q4	us-gaap	Restricted Cash And Investments Noncurrent RestrictedCashAndInvestmentsNoncurrent	53732000	USD
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
CY2010Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	40600000	USD
CY2010Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	43100000	USD
CY2010Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	43300000	USD
CY2009Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	33600000	USD
CY2009Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	34400000	USD
CY2009Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	33500000	USD
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2010
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-3311000	USD
CY2009Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	0	USD
CY2010Q3	us-gaap	Gain Loss On Investments GainLossOnInvestments	0	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	3232000	USD
	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	101000000	USD
CY2010Q3	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	47900000	USD
	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	778000	USD
	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-8464000	USD
CY2009	jnpr	Available For Sale Investments And Publicly Traded Securities Unrealized Loss AvailableForSaleInvestmentsAndPubliclyTradedSecuritiesUnrealizedLoss	-700000	USD
	jnpr	Available For Sale Investments And Publicly Traded Securities Unrealized Loss AvailableForSaleInvestmentsAndPubliclyTradedSecuritiesUnrealizedLoss	-200000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	5700000	shares
CY2009Q4	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	169000000	USD
	jnpr	Cash Payment From Acquisition Of Publicly Traded Company CashPaymentFromAcquisitionOfPubliclyTradedCompany	1000000	USD
CY2009Q4	us-gaap	Short Term Investments ShortTermInvestments	570522000	USD
CY2010Q3	us-gaap	Short Term Investments ShortTermInvestments	638523000	USD
	jnpr	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations During Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsDuringPeriodWeightedAverageExercisePrice	61.71
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	39400000	shares
	us-gaap	Share Based Compensation ShareBasedCompensation	101445000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	129555000	USD
CY2009Q3	us-gaap	Share Based Compensation ShareBasedCompensation	34300000	USD
CY2010Q3	us-gaap	Share Based Compensation ShareBasedCompensation	44400000	USD
CY2010Q3	us-gaap	Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Awards EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwards	118200000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	129600000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	101400000	USD
CY2010Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	44400000	USD
CY2009Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	34300000	USD
CY2010Q3	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0	USD
CY2009Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	0	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-143809000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-400494000	USD
CY2010Q3	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	200000	USD
CY2010Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	-2700000	USD
CY2010Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	6300000	USD
CY2010Q2	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	-4800000	USD
CY2009Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	4900000	USD
CY2009Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	-10500000	USD
CY2009Q2	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	11600000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	6000000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	-1200000	USD
	us-gaap	Future Amortization Expense Year Three FutureAmortizationExpenseYearThree	9600000	USD
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	522069000	shares
CY2009Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	523878000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	523802000	shares
CY2010Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	520581000	shares
	jnpr	Interest And Other Income Net InterestAndOtherIncomeNet	6581000	USD
	jnpr	Interest And Other Income Net InterestAndOtherIncomeNet	2497000	USD
CY2010Q3	jnpr	Interest And Other Income Net InterestAndOtherIncomeNet	205000	USD
CY2009Q3	jnpr	Interest And Other Income Net InterestAndOtherIncomeNet	1733000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	599382000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	547843000	USD
CY2010Q3	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	204704000	USD
CY2009Q3	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	183424000	USD
CY2010Q3	us-gaap	Business Acquisition Cost Of Acquired Entity Equity Interests Issued And Issuable BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable	2400000	USD
CY2010Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	149300000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	435100000	USD
CY2009Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	87800000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	101800000	USD
CY2009Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	71900000	USD
CY2010Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	134900000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	386700000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	241100000	USD
CY2010Q2	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	177400000	USD
CY2010Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	74400000	USD
CY2009Q2	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	49500000	USD
CY2009Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	119800000	USD
CY2009Q3	jnpr	Shares Repuchased And Retired Related To Net Issuances SharesRepuchasedAndRetiredRelatedToNetIssuances	-200000	USD
CY2009Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	455651000	USD
CY2010Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	484802000	USD
CY2009Q4	us-gaap	Long Term Investments LongTermInvestments	483505000	USD
CY2010Q3	us-gaap	Long Term Investments LongTermInvestments	599036000	USD
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	25.13
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	21.76
CY2010Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	521141000	shares
CY2009Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	519341000	shares
CY2010Q3	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.60	pure
CY2010Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2009Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
	us-gaap	Future Amortization Expense Year Four FutureAmortizationExpenseYearFour	9400000	USD
	jnpr	Total Management Operating Income TotalManagementOperatingIncome	438400000	USD
CY2010Q3	jnpr	Total Management Operating Income TotalManagementOperatingIncome	244500000	USD
	jnpr	Total Management Operating Income TotalManagementOperatingIncome	689900000	USD
CY2009Q3	jnpr	Total Management Operating Income TotalManagementOperatingIncome	171300000	USD
CY2009Q4	jnpr	Available For Sale Investments And Publicly Traded Securities Fair Value AvailableForSaleInvestmentsAndPubliclyTradedSecuritiesFairValue	1054000000	USD
CY2010Q3	jnpr	Available For Sale Investments And Publicly Traded Securities Fair Value AvailableForSaleInvestmentsAndPubliclyTradedSecuritiesFairValue	1237600000	USD
	us-gaap	Commitments And Contingencies2009 CommitmentsAndContingencies2009
CY2009	us-gaap	Commitments And Contingencies2009 CommitmentsAndContingencies2009
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	20.86
CY2010Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	440100000	USD
CY2009Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	435100000	USD
CY2010Q3	jnpr	Common Stock Repurchased Under Stock Repurchase Program Average Purchase Price CommonStockRepurchasedUnderStockRepurchaseProgramAveragePurchasePrice	26.81
	jnpr	Common Stock Repurchased Under Stock Repurchase Program Average Purchase Price CommonStockRepurchasedUnderStockRepurchaseProgramAveragePurchasePrice	19.18
CY2009Q3	jnpr	Common Stock Repurchased Under Stock Repurchase Program Average Purchase Price CommonStockRepurchasedUnderStockRepurchaseProgramAveragePurchasePrice	24.67
	jnpr	Common Stock Repurchased Under Stock Repurchase Program Average Purchase Price CommonStockRepurchasedUnderStockRepurchaseProgramAveragePurchasePrice	27.09
CY2009Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7590263000	USD
CY2010Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7890897000	USD
	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	-37300000	USD
CY2010Q3	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	-13700000	USD
CY2009Q3	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	-12100000	USD
	us-gaap	Standard Product Warranty Accrual Payments StandardProductWarrantyAccrualPayments	-31700000	USD
CY2010Q3	jnpr	Vested And Expected To Vest Restricted Stock Units And Performance Share Awards Weighted Average Grant Date Fair Value VestedAndExpectedToVestRestrictedStockUnitsAndPerformanceShareAwardsWeightedAverageGrantDateFairValue	24.83
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	526400000	USD
CY2010Q3	jnpr	Three Year Software Subscription Agreement Amount ThreeYearSoftwareSubscriptionAgreementAmount	7700000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	111803000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	112366000	USD
	jnpr	Shares Repurchased And Retired Related To Net Issuances SharesRepurchasedAndRetiredRelatedToNetIssuances	1900000	USD
CY2010Q3	jnpr	Shares Repurchased And Retired Related To Net Issuances SharesRepurchasedAndRetiredRelatedToNetIssuances	-100000	USD
CY2010Q1	jnpr	Shares Repurchased And Retired Related To Net Issuances SharesRepurchasedAndRetiredRelatedToNetIssuances	-1800000	USD
CY2010Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0	USD
	jnpr	Common Stock Issuance In Respect Of Assumed Awards In Connection With Acquisition CommonStockIssuanceInRespectOfAssumedAwardsInConnectionWithAcquisition	800000	shares
	jnpr	Additional Authorized Share Reserve Approved By Shareholders AdditionalAuthorizedShareReserveApprovedByShareholders	30000000	shares
CY2008Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	40100000	USD
CY2010Q3	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	36400000	USD
CY2009Q4	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	38200000	USD
CY2009Q3	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	37300000	USD
CY2009Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	35800000	USD
CY2010Q2	us-gaap	Standard Product Warranty Accrual StandardProductWarrantyAccrual	38300000	USD
	us-gaap	Proceeds From Sale And Collection Of Receivables ProceedsFromSaleAndCollectionOfReceivables	277200000	USD
CY2009Q3	us-gaap	Proceeds From Sale And Collection Of Receivables ProceedsFromSaleAndCollectionOfReceivables	101500000	USD
	us-gaap	Proceeds From Sale And Collection Of Receivables ProceedsFromSaleAndCollectionOfReceivables	423500000	USD
CY2010Q3	us-gaap	Proceeds From Sale And Collection Of Receivables ProceedsFromSaleAndCollectionOfReceivables	147000000	USD
	dei	Document Period End Date DocumentPeriodEndDate	2010-09-30
CY2009Q4	jnpr	Prepaid Expenses And Other Current Assets PrepaidExpensesAndOtherCurrentAssets	48744000	USD
CY2010Q3	jnpr	Prepaid Expenses And Other Current Assets PrepaidExpensesAndOtherCurrentAssets	111466000	USD
CY2009Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	458652000	USD
CY2010Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	473953000	USD
CY2010Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	195741000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	546515000	USD
CY2009Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	129688000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	308113000	USD
	dei	Entity Central Index Key EntityCentralIndexKey	0001043604
CY2009Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	5000	USD
CY2010Q3	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	5000	USD
	jnpr	Common Stock Average Purchase Price CommonStockAveragePurchasePrice	25.75
CY2010Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	5000000	shares
	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	12600000	shares
CY2009Q3	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	2900000	shares
	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	14300000	shares
CY2009Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	170245000	USD
CY2010Q3	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	98198000	USD
CY2010Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	172200000	USD
CY2010Q3	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	190701000	USD
CY2009Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	181937000	USD
CY2009Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	34300000	USD
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	44400000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	129600000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCost	101400000	USD
CY2010Q3	jnpr	Outstanding Stock Options And Restricted Stock Units Covering Shares Of Common Stock OutstandingStockOptionsAndRestrictedStockUnitsCoveringSharesOfCommonStock	2100000	shares
CY2010Q3	jnpr	Vesting Period For Restricted Shares VestingPeriodForRestrictedShares	2	pure
	jnpr	Contractual Period ContractualPeriod	one to three years
CY2009Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2010Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-200000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1100000	USD
CY2010Q3	us-gaap	Restructuring Charges RestructuringCharges	181000	USD
	us-gaap	Restructuring Charges RestructuringCharges	8550000	USD
	us-gaap	Restructuring Charges RestructuringCharges	16251000	USD
CY2009Q3	us-gaap	Restructuring Charges RestructuringCharges	4493000	USD
CY2010Q3	jnpr	Other Contractual Obligations OtherContractualObligations	57900000	USD
CY2010Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	0	USD
	jnpr	Fair Market Value On Date Of Grant For Rsus And Psas Issued At Discount Maximum Percentage FairMarketValueOnDateOfGrantForRsusAndPsasIssuedAtDiscountMaximumPercentage	1	pure
CY2010Q3	jnpr	Vested And Expected To Vest Restricted Stock Units And Performance Share Awards Number Of Shares VestedAndExpectedToVestRestrictedStockUnitsAndPerformanceShareAwardsNumberOfShares	10400000	shares
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	31800000	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	18000000	shares
CY2010Q3	jnpr	Program Licensing And Technical Support ProgramLicensingAndTechnicalSupport	9100000	USD
	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	700000	USD
CY2009Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	100000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1400000	USD
CY2010Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-100000	USD
	us-gaap	Operating Leases Rent Expense Minimum Rentals OperatingLeasesRentExpenseMinimumRentals	41800000	USD
CY2010Q3	us-gaap	Operating Leases Rent Expense Minimum Rentals OperatingLeasesRentExpenseMinimumRentals	14000000	USD
	us-gaap	Operating Leases Rent Expense Minimum Rentals OperatingLeasesRentExpenseMinimumRentals	42600000	USD
CY2009Q3	us-gaap	Operating Leases Rent Expense Minimum Rentals OperatingLeasesRentExpenseMinimumRentals	14200000	USD
CY2009	us-gaap	Trading Securities Unrealized Holding Loss TradingSecuritiesUnrealizedHoldingLoss	0	USD
	us-gaap	Trading Securities Unrealized Holding Loss TradingSecuritiesUnrealizedHoldingLoss	0	USD
CY2010Q3	jnpr	Percent Of Property And Equipment Held In Us PercentOfPropertyAndEquipmentHeldInUs	0.80	pure
CY2009Q4	jnpr	Percent Of Property And Equipment Held In Us PercentOfPropertyAndEquipmentHeldInUs	0.80	pure
CY2009Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.00001	USD
CY2010Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.00001	USD
CY2010Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	43773000	USD
CY2009Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	39877000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	118263000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	132791000	USD
	us-gaap	Future Amortization Expense Year Five FutureAmortizationExpenseYearFive	7600000	USD
CY2010Q2	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	-1000000	USD
CY2010Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders		USD
CY2010Q1	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	-2000000	USD
CY2010Q3	us-gaap	Gross Profit GrossProfit	677787000	USD
	us-gaap	Gross Profit GrossProfit	1949746000	USD
CY2009Q3	us-gaap	Gross Profit GrossProfit	543283000	USD
	us-gaap	Gross Profit GrossProfit	1551957000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	744464000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	262325000	USD
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	13600000	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	9100000	shares
CY2010Q3	jnpr	Amount Of Restricted Investments Measured At Fair Value Included In Balance Of Government Securities AmountOfRestrictedInvestmentsMeasuredAtFairValueIncludedInBalanceOfGovernmentSecurities	600000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-20873000	USD
	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	8390000	USD
	dei	Entity Registrant Name EntityRegistrantName	JUNIPER NETWORKS INC
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	67813000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	11444000	USD
CY2010Q3	jnpr	Future Minimum Payments Under Non Cancelable Operating Leases Net Of Committed Sublease Income Total FutureMinimumPaymentsUnderNonCancelableOperatingLeasesNetOfCommittedSubleaseIncomeTotal	278600000	USD
CY2009Q4	us-gaap	Deferred Revenue DeferredRevenue	753600000	USD
CY2010Q3	us-gaap	Deferred Revenue DeferredRevenue	785100000	USD
	jnpr	Possible Decrease In Gross Unrecognized Tax Benefits Within Next Twelve Months PossibleDecreaseInGrossUnrecognizedTaxBenefitsWithinNextTwelveMonths	-7100000	USD
CY2010Q3	jnpr	Indemnity Related Escrow Amount IndemnityRelatedEscrowAmount	26900000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Other Increases Decreases In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOtherIncreasesDecreasesInPeriod	400000	shares
CY2010Q3	jnpr	Sale Of Receivable SaleOfReceivable	153100000	USD
	jnpr	Sale Of Receivable SaleOfReceivable	294900000	USD
	jnpr	Sale Of Receivable SaleOfReceivable	435500000	USD
CY2009Q3	jnpr	Sale Of Receivable SaleOfReceivable	122500000	USD
	jnpr	Share Based Compensation Arrangement By Share Based Payment Awards Options Assumed In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardsOptionsAssumedInPeriodWeightedAverageExercisePrice	29.42
	us-gaap	Payments For Legal Settlements PaymentsForLegalSettlements	169330000	USD
	us-gaap	Payments For Legal Settlements PaymentsForLegalSettlements	0	USD
CY2010Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
CY2009Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000	shares
	jnpr	Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue	66300000	USD
CY2010Q3	jnpr	Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodTotalFairValue	19200000	USD
	dei	Document Type DocumentType	10-Q
	jnpr	Maturities Of Cash Flow Hedge Derivatives MaturitiesOfCashFlowHedgeDerivatives	less than one year
CY2010Q3	us-gaap	Business Combination Consideration Transferred BusinessCombinationConsiderationTransferred	138400000	USD
CY2009Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	13800000	USD
CY2010Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	47600000	USD
CY2010Q3	jnpr	Accrued Estimate Carrying Charges Or Obsolete Materials Charges AccruedEstimateCarryingChargesOrObsoleteMaterialsCharges	21200000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1604723000	USD
CY2010Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1460914000	USD
CY2009Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1618590000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2019084000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-15093000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	56729000	USD
CY2009Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1375785000	USD
CY2010Q3	us-gaap	Liabilities Current LiabilitiesCurrent	1240767000	USD
CY2010Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	448900000	USD
CY2009Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	448900000	USD
	jnpr	Future Amortization Expense Remaining Three Months FutureAmortizationExpenseRemainingThreeMonths	2900000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	14500000	shares
CY2010Q3	jnpr	Principal Contractual Obligations Total PrincipalContractualObligationsTotal	624700000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	257693000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	131391000	USD
CY2010Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	521141000	shares
CY2009Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	519341000	shares
CY2010Q3	jnpr	Liabilitiy For Uncertain Tax Position LiabilitiyForUncertainTaxPosition	102200000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-41996000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-26425000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	101800000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	434000000	USD
CY2009Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	87800000	USD
CY2010Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	149500000	USD
	jnpr	Restricted Stock Units And Performance Share Awards Weighted Average Remaining Contractual Term RestrictedStockUnitsAndPerformanceShareAwardsWeightedAverageRemainingContractualTerm	1.8
CY2009Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2010Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
	us-gaap	Operating Income Loss OperatingIncomeLoss	540786000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	304843000	USD
CY2009Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	127955000	USD
CY2010Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	195536000	USD
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2100000	USD
CY2010Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	1500000	USD
CY2010Q3	jnpr	Gross Goodwill GrossGoodwill	5039600000	USD
CY2009Q4	jnpr	Gross Goodwill GrossGoodwill	4938600000	USD
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	55800000	shares
CY2009Q4	jnpr	Cash Received From Financing Provider That Has Not Been Recognized As Revenue CashReceivedFromFinancingProviderThatHasNotBeenRecognizedAsRevenue	52600000	USD
CY2010Q3	jnpr	Cash Received From Financing Provider That Has Not Been Recognized As Revenue CashReceivedFromFinancingProviderThatHasNotBeenRecognizedAsRevenue	35700000	USD
CY2010Q3	jnpr	Fair Value Transfers Of Assets And Liabilities Between Levels Of Fair Value Hierarchy FairValueTransfersOfAssetsAndLiabilitiesBetweenLevelsOfFairValueHierarchy	0	USD
	jnpr	Fair Value Transfers Of Assets And Liabilities Between Levels Of Fair Value Hierarchy FairValueTransfersOfAssetsAndLiabilitiesBetweenLevelsOfFairValueHierarchy	0	USD
CY2010Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	4427000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1433000	USD
	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	-3300000	USD
CY2009Q3	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
CY2010Q3	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	0	USD
	us-gaap	Cash Flow Hedge Ineffectiveness Is Immaterial CashFlowHedgeIneffectivenessIsImmaterial	immaterial
CY2009Q3	us-gaap	Cash Flow Hedge Ineffectiveness Is Immaterial CashFlowHedgeIneffectivenessIsImmaterial	immaterial
	us-gaap	Cash Flow Hedge Ineffectiveness Is Immaterial CashFlowHedgeIneffectivenessIsImmaterial	immaterial
CY2010Q3	us-gaap	Cash Flow Hedge Ineffectiveness Is Immaterial CashFlowHedgeIneffectivenessIsImmaterial	immaterial
CY2010Q3	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	29762000	USD
CY2009Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	34936000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Other Share Increase Decrease ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherShareIncreaseDecrease	-1800000	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	1500000	shares
CY2010Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	9449553000	USD
CY2009Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	9060089000	USD
	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses	-200000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm	4.1
	jnpr	Contractual Support Period ContractualSupportPeriod	one year or less
	us-gaap	Other General Expense OtherGeneralExpense	1000000	USD
	us-gaap	Other General Expense OtherGeneralExpense	2066000	USD
CY2009Q3	us-gaap	Other General Expense OtherGeneralExpense	1000000	USD
CY2010Q3	us-gaap	Other General Expense OtherGeneralExpense	1525000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.21	pure
CY2009Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.35	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.69	pure
CY2010Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.31	pure
	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	12432000	USD
	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	11276000	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	134543000	USD
CY2009Q3	us-gaap	Net Income Loss NetIncomeLoss	83786000	USD
	us-gaap	Net Income Loss NetIncomeLoss	428169000	USD
	us-gaap	Net Income Loss NetIncomeLoss	94095000	USD
CY2010Q3	jnpr	Amount Of Restricted Investments Measured At Fair Value Included In Balance Of Corporate Debt Securities AmountOfRestrictedInvestmentsMeasuredAtFairValueIncludedInBalanceOfCorporateDebtSecurities	2700000	USD
	us-gaap	Restructuring Reserve Accrual Adjustment RestructuringReserveAccrualAdjustment	-1900000	USD
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	37500000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	133900000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-830007000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-467130000	USD
	us-gaap	Cost Of Revenue CostOfRevenue	822501000	USD
CY2009Q3	us-gaap	Cost Of Revenue CostOfRevenue	280629000	USD
	us-gaap	Cost Of Revenue CostOfRevenue	953579000	USD
CY2010Q3	us-gaap	Cost Of Revenue CostOfRevenue	334620000	USD
CY2009Q3	us-gaap	Cost Of Services CostOfServices	74300000	USD
	us-gaap	Cost Of Services CostOfServices	215535000	USD
	us-gaap	Cost Of Services CostOfServices	252413000	USD
CY2010Q3	us-gaap	Cost Of Services CostOfServices	87587000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	1800000	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	67400000	shares
CY2010Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	58800000	shares
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	32932000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	-673000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm	3.6
	jnpr	Common Stock For Each Share Subject To Rsus And Psas CommonStockForEachShareSubjectToRsusAndPsas	2.1	pure
CY2010Q3	us-gaap	Recorded Unconditional Purchase Obligation RecordedUnconditionalPurchaseObligation	186000000	USD
CY2009Q4	jnpr	Unrealized Gains On Restricted Investments UnrealizedGainsOnRestrictedInvestments	0	USD
CY2010Q3	jnpr	Unrealized Gains On Restricted Investments UnrealizedGainsOnRestrictedInvestments	0	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	3000000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2009	jnpr	Available For Sale Investments And Publicly Traded Securities Unrealized Gain AvailableForSaleInvestmentsAndPubliclyTradedSecuritiesUnrealizedGain	3000000	USD
	jnpr	Available For Sale Investments And Publicly Traded Securities Unrealized Gain AvailableForSaleInvestmentsAndPubliclyTradedSecuritiesUnrealizedGain	7500000	USD
CY2010Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	101200000	USD
CY2010Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	62400000	USD
CY2010Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	53700000	USD
CY2009Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	61100000	USD
CY2009Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3300000	USD
CY2009Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	29200000	USD
	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2009Q3	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2010Q3	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	0	USD
CY2009Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	176551000	USD
CY2010Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	184941000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	202276000	USD
CY2009	us-gaap	Trading Securities Unrealized Holding Gain TradingSecuritiesUnrealizedHoldingGain	0	USD
CY2010Q3	jnpr	Restricted Cash Distribution For Settlement Of Acquisition RestrictedCashDistributionForSettlementOfAcquisition	64100000	USD
	jnpr	Restricted Cash Distribution For Settlement Of Acquisition RestrictedCashDistributionForSettlementOfAcquisition	124900000	USD
	jnpr	Share Based Compensation Arrangement By Share Based Payment Award Option Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionExercisesInPeriodWeightedAverageExercisePrice	17.94
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	532686000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	537158000	shares
	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	440788000	USD
CY2010Q3	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	201700000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	31274000	USD
	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	52932000	USD
	jnpr	Derivative Instrument Ineffectiveness Is Immaterial DerivativeInstrumentIneffectivenessIsImmaterial	immaterial
CY2010Q3	jnpr	Derivative Instrument Ineffectiveness Is Immaterial DerivativeInstrumentIneffectivenessIsImmaterial	immaterial
	jnpr	Derivative Instrument Ineffectiveness Is Immaterial DerivativeInstrumentIneffectivenessIsImmaterial	immaterial
CY2009Q3	jnpr	Derivative Instrument Ineffectiveness Is Immaterial DerivativeInstrumentIneffectivenessIsImmaterial	immaterial
CY2010Q3	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	-1900000	USD
	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	-4500000	USD
	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	-2400000	USD
CY2009Q3	us-gaap	Product Warranty Accrual Preexisting Increase Decrease ProductWarrantyAccrualPreexistingIncreaseDecrease	-1100000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod	-12200000	shares
CY2009Q3	jnpr	Verizon Accounted Net Revenues VerizonAccountedNetRevenues	0.104	pure
	jnpr	Verizon Accounted Net Revenues VerizonAccountedNetRevenues	0.1	pure
CY2009Q3	jnpr	Reclassified Sales And Marketing Expense ReclassifiedSalesAndMarketingExpense	6100000	USD
	jnpr	Reclassified Sales And Marketing Expense ReclassifiedSalesAndMarketingExpense	18700000	USD
	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	0	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	32932000	USD
	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	-673000	USD
CY2010Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	534880000	shares
CY2009Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	538132000	shares
CY2010Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	523202000	shares
	jnpr	Number Of Days Due From Receivable NumberOfDaysDueFromReceivable	30	pure
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	15100000	shares
CY2009Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	14200000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	8900000	shares
CY2010Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	14300000	shares
CY2009Q4	jnpr	Available For Sale Investments And Publicly Traded Securities Amortized Cost AvailableForSaleInvestmentsAndPubliclyTradedSecuritiesAmortizedCost	1051700000	USD
CY2010Q3	jnpr	Available For Sale Investments And Publicly Traded Securities Amortized Cost AvailableForSaleInvestmentsAndPubliclyTradedSecuritiesAmortizedCost	1230300000	USD
CY2010Q3	jnpr	Closing Stock Price At Plan Period End ClosingStockPriceAtPlanPeriodEnd	30.35
	jnpr	Common Stock Value From Acquisition Of Publicly Traded Company CommonStockValueFromAcquisitionOfPubliclyTradedCompany	1000000	USD
CY2009Q4	jnpr	Receivables From Sale Of Receivables ReceivablesFromSaleOfReceivables	89800000	USD
CY2010Q3	jnpr	Receivables From Sale Of Receivables ReceivablesFromSaleOfReceivables	101600000	USD
	jnpr	Stock Repurchased And Retired During Period Net Of Issuances Shares StockRepurchasedAndRetiredDuringPeriodNetOfIssuancesShares	100000	shares
	jnpr	Stock Repurchased And Retired During Period Net Of Issuances Shares StockRepurchasedAndRetiredDuringPeriodNetOfIssuancesShares	0	shares
CY2009Q3	jnpr	Stock Repurchased And Retired During Period Net Of Issuances Shares StockRepurchasedAndRetiredDuringPeriodNetOfIssuancesShares	0	shares
CY2010Q3	jnpr	Stock Repurchased And Retired During Period Net Of Issuances Shares StockRepurchasedAndRetiredDuringPeriodNetOfIssuancesShares	0	shares
CY2010Q3	us-gaap	Assets Assets	7890897000	USD
CY2009Q4	us-gaap	Assets Assets	7590263000	USD
CY2010Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	143836000	USD
CY2009Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	142526000	USD
CY2010Q3	us-gaap	Restructuring Reserve RestructuringReserve	8900000	USD
CY2009Q4	us-gaap	Restructuring Reserve RestructuringReserve	9400000	USD
CY2010Q2	jnpr	Value Shares Assumed In Connection With Business Acquisition ValueSharesAssumedInConnectionWithBusinessAcquisition	2300000	USD
CY2009Q4	jnpr	Total Investments In Unrealized Loss Position TotalInvestmentsInUnrealizedLossPosition	52	pure
CY2010Q3	jnpr	Total Investments In Unrealized Loss Position TotalInvestmentsInUnrealizedLossPosition	46	pure
CY2009Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	24400000	shares
CY2010Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	16800000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	16400000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	48400000	shares
	jnpr	Share Based Compensation Arrangement Vesting Period Psa In Years ShareBasedCompensationArrangementVestingPeriodPsaInYears	3	pure
CY2009Q3	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	2800000	USD
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	10700000	USD
CY2010Q3	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	3200000	USD
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	9800000	USD
CY2010Q3	us-gaap	Business Acquisition Cost Of Acquired Entity Cash Paid BusinessAcquisitionCostOfAcquiredEntityCashPaid	136000000	USD
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	2338000	USD
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	0	USD
CY2010Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2009Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.18
CY2009Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.8
CY2010Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2009Q3	us-gaap	Profit Loss ProfitLoss	83786000	USD
	us-gaap	Profit Loss ProfitLoss	94095000	USD
	us-gaap	Profit Loss ProfitLoss	429290000	USD
CY2010Q1	us-gaap	Profit Loss ProfitLoss	164600000	USD
CY2010Q2	us-gaap	Profit Loss ProfitLoss	130300000	USD
CY2010Q3	us-gaap	Profit Loss ProfitLoss	134337000	USD
CY2009Q2	us-gaap	Profit Loss ProfitLoss	14700000	USD
CY2009Q1	us-gaap	Profit Loss ProfitLoss	-4500000	USD
CY2010Q3	jnpr	Estimated Incremental Tax Liability Excluding Interest And Penalties Related To Nopa EstimatedIncrementalTaxLiabilityExcludingInterestAndPenaltiesRelatedToNopa	807000000	USD
CY2010Q3	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	8700000	USD
CY2010Q2	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-1300000	USD
CY2010Q1	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-400000	USD
CY2009Q2	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	6200000	USD
CY2009Q3	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-900000	USD
CY2009Q1	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	-3600000	USD
	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	7000000	USD
	us-gaap	Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentNetOfTaxPeriodIncreaseDecrease	1700000	USD
CY2010Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6316899000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5824765000	USD
CY2010Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6121300000	USD
CY2010Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6171800000	USD
CY2009Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5957400000	USD
CY2009Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5829700000	USD
CY2008Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5901400000	USD
CY2009Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5816800000	USD
CY2010Q3	jnpr	Unrealized Losses On Restricted Investments UnrealizedLossesOnRestrictedInvestments	0	USD
CY2009Q4	jnpr	Unrealized Losses On Restricted Investments UnrealizedLossesOnRestrictedInvestments	0	USD
CY2010Q3	jnpr	Restricted Stock Units And Performance Share Awards Aggregate Intrinsic Value RestrictedStockUnitsAndPerformanceShareAwardsAggregateIntrinsicValue	411400000	USD
CY2010Q2	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	5400000	USD
CY2010Q1	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	50600000	USD
CY2010Q3	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	4300000	USD
CY2009Q1	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	10500000	USD
CY2009Q3	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	9600000	USD
CY2009Q2	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	-58600000	USD
CY2010Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1012407000	USD
	us-gaap	Sales Revenue Net SalesRevenueNet	2374458000	USD
CY2009Q3	us-gaap	Sales Revenue Net SalesRevenueNet	823912000	USD
	us-gaap	Sales Revenue Net SalesRevenueNet	2903325000	USD
CY2010Q3	us-gaap	Cost Of Goods Sold CostOfGoodsSold	247033000	USD
	us-gaap	Cost Of Goods Sold CostOfGoodsSold	701166000	USD
	us-gaap	Cost Of Goods Sold CostOfGoodsSold	606966000	USD
CY2009Q3	us-gaap	Cost Of Goods Sold CostOfGoodsSold	206329000	USD
	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	-200000	USD

Files In Submission

Name	View Source	Status
0000950123-10-101603-index-headers.html	Edgar Link	pending
0000950123-10-101603-index.html	Edgar Link	pending
0000950123-10-101603.txt	Edgar Link	pending
0000950123-10-101603-xbrl.zip	Edgar Link	pending
defnref.xml	Edgar Link	unprocessable
f57093e10vq.htm	Edgar Link	pending
f57093exv10w1.htm	Edgar Link	pending
f57093exv10w2.htm	Edgar Link	pending
f57093exv10w3.htm	Edgar Link	pending
f57093exv31w1.htm	Edgar Link	pending
f57093exv31w2.htm	Edgar Link	pending
f57093exv32w1.htm	Edgar Link	pending
f57093exv32w2.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
jnpr-20100930.xml	Edgar Link	completed
jnpr-20100930.xsd	Edgar Link	pending
jnpr-20100930_cal.xml	Edgar Link	unprocessable
jnpr-20100930_def.xml	Edgar Link	unprocessable
jnpr-20100930_lab.xml	Edgar Link	unprocessable
jnpr-20100930_pre.xml	Edgar Link	unprocessable
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R9.xml	Edgar Link	unprocessable

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$JNPR
JUNIPER NETWORKS INC Stock $jnpr

2010 Q4 Form 10-Q Financial Statement

#000095012310101603 Filed on November 05, 2010

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$JNPR JUNIPER NETWORKS INC Stock $jnpr

2010 Q4 Form 10-Q Financial Statement

#000095012310101603 Filed on November 05, 2010

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$JNPR
JUNIPER NETWORKS INC Stock $jnpr