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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Income tax (benefit) provision | $ 15,760 | $ 14,833 | $ 30,213 | $ (1,277)
Income tax (benefit) provision tax rate | 26.80% |  | 25.80% |
U.S. corporate federal statutory income tax rate |  |  | 21.00% |

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