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Income Taxes - U.S. Tax Law Change - Narrative (Detail) - GILTI [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 02, 2020 | Jan. 31, 2021 | May 03, 2020 | Apr. 28, 2019
Income Taxes [Line Items] |  |  |  |
Income tax charge of during period |  |  | $ 1.9 | $ 2.1
Non-cash income tax benefit | $ 3.5 | $ 3.5 |  |

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