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Stockholders' Equity - Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2021 | Apr. 24, 2020 | Apr. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | $ 197 | $ 153 | $ 158
Income tax benefit for stock-based compensation | 17 | 15 | 15
Cost of Product Revenues |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | 4 | 3 | 4
Cost of Hardware Support and Other Services Revenues |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | 10 | 10 | 10
Sales and Marketing |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | 92 | 66 | 67
Research and Development |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | 64 | 53 | 48
General and Administrative |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | $ 27 | $ 21 | $ 29

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