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Stockholders' Equity - Schedule of Employee Stock Purchase Plan (ESPP) (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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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

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