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Stockholders' Equity - Schedule of Employee Stock Purchase Plan (ESPP) (Detail) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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Jul. 31, 2020 | Jul. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued under the ESPP | 1 | 1
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Proceeds from issuance of shares | $ 48 | $ 54

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