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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Apr. 24, 2015 | Apr. 25, 2014 | Apr. 26, 2013 | Apr. 27, 2012
Income Tax Contingency [Line Items] |  |  |  |
Deferred tax assets, increase/decrease in valuation allowance | $ 8,100,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 9,800,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |
Operating loss and credit carryforwards, expiration dates range, minimum | 2018 |  |  |
Operating loss and credit carryforwards, expiration dates range, maximum | 2035 |  |  |
Gross unrecognized tax benefits | 271,900,000 us-gaap_UnrecognizedTaxBenefits | 235,900,000 us-gaap_UnrecognizedTaxBenefits | 189,600,000 us-gaap_UnrecognizedTaxBenefits | 161,000,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits included in other long-term liabilities | 213,600,000 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent |  |  |
Unrecognized tax benefits that would affect provision for income taxes | 167,500,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |
Tax penalties and interest on unrecognized tax benefits | 3,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 2,200,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 1,200,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |
Accrued tax penalties and interest on unrecognized tax benefits | 8,600,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 5,000,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |
Resolution of income tax examinations | 46,400,000 us-gaap_IncomeTaxReconciliationTaxSettlements | 0 us-gaap_IncomeTaxReconciliationTaxSettlements | 100,000 us-gaap_IncomeTaxReconciliationTaxSettlements |
Expected refund, excluding interest from fiscal 2005 to 2007 income tax audit | 8,000,000 us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority |  |  |
Estimated potential decrease in unrecognized tax benefit balance | 95,400,000 us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible |  |  |
Accumulated unremitted earnings from foreign subsidiaries | 3,300,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Estimated unrecognized deferred tax liability on unremitted earnings of foreign subsidiaries | 1,000,000,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries |  |  |
United Kingdom |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Resolution of income tax examinations | (1,000,000)us-gaap_IncomeTaxReconciliationTaxSettlements / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_HerMajestysRevenueAndCustomsHMRCMember |  |  |
Federal Income Tax |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carry forwards | 21,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Tax credit carry forward amount | 117,000,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Resolution of income tax examinations | 47,400,000 us-gaap_IncomeTaxReconciliationTaxSettlements / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
State and Local Income Tax |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carry forwards | 85,400,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
Tax credit carry forward amount | 145,500,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
Additional Paid-in Capital |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | $ 122,000,000 ntap_UnrecognizedOperatingLossAndTaxCreditCarryforwardsThatWillBeRecognizedInEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |

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