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Segment Geographic and Significant Customer Information - Schedule of Net Accounts Receivable from Significant Customers (Detail) (Accounts Receivable, Credit Concentration Risk) | 9 Months Ended | 12 Months Ended
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Jan. 23, 2015 | Apr. 25, 2014
Arrow Electronics, Inc. |  |
Segment Reporting Information [Line Items] |  |
Percentage of net accounts receivable | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = ntap_ArrowElectronicsIncMember | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = ntap_ArrowElectronicsIncMember
Avnet, Inc. |  |
Segment Reporting Information [Line Items] |  |
Percentage of net accounts receivable |  | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = ntap_AvnetIncMember

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