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Stockholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended | 143 Months Ended | 0 Months Ended
--- | --- | --- | ---
Apr. 24, 2015 | Apr. 25, 2014 | Apr. 26, 2013 | Apr. 24, 2015 | May 20, 2015 | Sep. 05, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense related to equity awards | $ 358,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  | $ 358,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years | 2 years 2 months 12 days |  |  |  |  |
Stock repurchase program, authorized amount | 9,600,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  | 9,600,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |
Allocation of purchase price of share repurchases | 1,165,200,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | 1,881,500,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | 590,000,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |
Repurchase of common stock, shares | 29,600,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 47,300,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 18,100,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 214,000,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |
Average price of common stock repurchased under repurchase program | $ 39.30 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 39.78 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 32.68 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 33.48 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |
Aggregate purchase price of common stock authorized under repurchase program |  |  |  | 7,200,000,000 us-gaap_PaymentsForRepurchaseOfEquity |  |
Prepayment to purchase shares of common stock |  | 750,000,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt |  |  |  |
Accelerated share repurchases, weighted-average price |  | $ 39.13 us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare |  |  |  |
Preferred stock, shares authorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Preferred stock, shares issued | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |  | 0 us-gaap_PreferredStockSharesIssued |  |
Preferred stock, shares outstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding |  | 0 us-gaap_PreferredStockSharesOutstanding |  |
Dividends declared |  |  | 0 ntap_DividendsDeclared |  |  |
Dividends paid | 207,400,000 us-gaap_PaymentsOfDividends | 202,300,000 us-gaap_PaymentsOfDividends | 0 us-gaap_PaymentsOfDividends |  |  |
Cash dividends declared, per common share | $ 0.66 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |
Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash dividends declared, per common share |  |  |  |  | $ 0.18 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Cash dividend payable date |  |  |  |  | Jul. 23, 2015 |
Cash dividend record date |  |  |  |  | Jul. 10, 2015 |
Additional Paid-in Capital |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Allocation of purchase price of share repurchases | 812,800,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 813,400,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 176,200,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Value of forward contract |  | 13,900,000 ntap_ValueOfAcceleratedShareRepurchaseAgreementForwardContractValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Dividends paid | 52,000,000 us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 50,400,000 us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Retained Earnings |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Allocation of purchase price of share repurchases | 352,400,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1,068,000,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 413,800,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Dividends paid | 155,400,000 us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 151,900,000 us-gaap_PaymentsOfDividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Repurchase of common stock, shares |  | 19,200,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = ntap_AcceleratedShareRepurchaseAgreementMember |  |  |  |
Share Repurchase Authorization Increase |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount | 2,500,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = ntap_ShareRepurchaseAuthorizationIncreaseMember |  |  | 2,500,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = ntap_ShareRepurchaseAuthorizationIncreaseMember |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Additional shares authorized |  |  |  |  |  | 5,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember
Shares available for grant | 8,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  |  | 8,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  |
Share offering period for eligible employees | 24 months |  |  |  |  |
Number of consecutive purchase periods | 4 ntap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPurchasePeriods / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Duration of purchase period | 6 months |  |  |  |  |
Percentage of discount from quoted market price, employees entitled to buy shares (ESPP) | 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  |  |  |  |
1999 Stock Option Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Decrease in number of shares reserved for issuance for every share subject to a full value award | 2 ntap_CommonStockCapitalSharesReservedForFutureIssuanceDecrease / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |  |  |  |
Number of shares that may be granted to a participant in any calendar year | 1,000,000 ntap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedPerParticipant / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |  |  |  |
Maximum initial value of performance units a participant may receive | $ 5,000,000 ntap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberValuePerEmployee / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |  |  |  |
Number of performance shares a participant may receive in a calendar year | 1,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |  |  |  |
Additional shares authorized | 7,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |  |  |  |
Shares available for grant | 12,700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |  | 12,700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |
1999 Stock Option Plan | Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Purchase price of common stock, percentage | 100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |  |  |  |
Award granted, vesting period | 4 years |  |  |  |  |
Options granted period term | 7 years |  |  |  |  |
1999 Stock Option Plan | Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award granted, vesting period | 4 years |  |  |  |  |
Vesting rate | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = ntap_NineteenNinetyNineStockOptionPlanMember |  |  |  |  |

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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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