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Stockholders' Equity - Schedule of Employee Stock Purchase Plan (ESPP) (Detail) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Apr. 27, 2018
Apr. 28, 2017
Apr. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued under the ESPP 4 4 3
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from issuance of shares $ 85 $ 80 $ 93