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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 8 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 24, 2020 | Jan. 25, 2019 | Dec. 31, 2017 | Jan. 24, 2020 | Jan. 25, 2019 | Apr. 26, 2019
Income Tax Contingency [Line Items] |  |  |  |  |  |
U.S. federal corporate tax rate |  |  | 35.00% | 21.00% |  |
Provision (benefit) for income taxes | $ (1) | $ 70 |  | $ 71 | $ 111 |
Discrete tax benefit due to lapse of certain statutes of limitations | 50 |  |  |  |  |
Gross unrecognized tax benefits | 187 |  |  | 187 |  |
Gross unrecognized tax benefits included in other long-term liabilities | 167 |  |  | 167 |  | $ 252
Unrecognized tax benefits that would affect provision for income taxes | $ 165 |  |  | $ 165 |  |
Impact of ASC 606 Adoption | ASC 606 |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Provision (benefit) for income taxes |  |  |  |  | $ (34) |

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