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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
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