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Commitments and Contingencies - Additional Information (Detail) - USD ($)
6 Months Ended
Oct. 25, 2019
Oct. 26, 2018
Apr. 26, 2019
Commitments and Contingencies Disclosure [Line Items]      
Accrued purchase commitments with contract manufacturers $ 13,000,000   $ 16,000,000
Sale of finance receivables $ 34,000,000 $ 43,000,000  
Lawsuit commencement date August 14, 2019    
Lawsuit action domicile United States District Court for the Northern District of California    
Name of defendant NetApp and certain of our executive officers    
Loss contingency, laws affected The complaint alleges that the defendants violated Section 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and SEC Rule 10b-5, by making materially false or misleading statements with respect to our financial guidance for fiscal 2020, as provided on May 22, 2019.    
Legal proceedings and claims $ 0    
Management estimation of loss contingency Although management at present believes that the ultimate outcome of these proceedings, individually and in the aggregate, will not materially harm our financial position, results of operations, cash flows, or overall trends, legal proceedings are subject to inherent uncertainties, and unfavorable rulings or other events could occur. Unfavorable resolutions could include significant monetary damages. In addition, in matters for which injunctive relief or other conduct remedies are sought, unfavorable resolutions could include an injunction or other order prohibiting us from selling one or more products at all or in particular ways or requiring other remedies. An unfavorable outcome may result in a material adverse impact on our business, results of operations, financial position, and overall trends.    
Maximum      
Commitments and Contingencies Disclosure [Line Items]      
Terms of recourse leases 3 years    
Inventory      
Commitments and Contingencies Disclosure [Line Items]      
Purchase orders and other commitments $ 447,000,000    
Construction Related      
Commitments and Contingencies Disclosure [Line Items]      
Purchase orders and other commitments 5,000,000    
Other      
Commitments and Contingencies Disclosure [Line Items]      
Purchase orders and other commitments $ 244,000,000