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Stockholders' Equity - Schedule of Employee Stock Purchase Plan (ESPP) (Detail) - USD ($) shares in Millions, $ in Millions | 6 Months Ended
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Oct. 26, 2018 | Oct. 27, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued under the ESPP | 2 | 2
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Proceeds from issuance of shares | $ 49 | $ 42

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