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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Income tax (benefit) provision | $ 12,877 | $ 15,760 | $ 4,205 | $ 30,213
Income tax (benefit) provision tax rate | 31.40% |  | 294.50% |

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