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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 8 Months Ended
--- | --- | ---
May 04, 2019 | May 05, 2018 | May 04, 2019 | May 05, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Effective tax rate | 19.50% | 27.20% | 19.80% | 14.80%
U.S. corporate income tax rate | 21.00% | 25.90% |  |
Income Tax Expense Benefit From Stock Option Exercises | $ 13.1 |  | $ 38.2 | $ 27.2
One-time mandatory transition tax benefit |  |  | $ 111.9 |

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