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Stockholders' Equity - Schedule of Employee Stock Purchase Plan (ESPP) (Detail) - USD ($) shares in Millions, $ in Millions | 9 Months Ended
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Jan. 24, 2020 | Jan. 25, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued under the ESPP | 2 | 3
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Proceeds from issuance of shares | $ 98 | $ 96

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