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Income Taxes - Reconciliation of Provision for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes expected at the statutory rate | [1] | $ 66,773 | $ 8,233 | $ 7,183
State income taxes, less federal income tax benefit |  | 7,685 | 1,628 | 1,737
Stock compensation |  | (578) | 1,077 | 646
Business meals and entertainment |  | 115 | 257 | 144
Research and development tax credit |  | (297) | (496) | (460)
Non-deductible Separation expenses |  | 195 | 688 |
Other |  | 501 | 135 | 105
Federal tax rate change on deferred taxes |  |  |  | (71)
Total income tax expense/(benefit) |  | $ 74,394 | $ 11,522 | $ 9,284
[1] | We had a statutory rate of 21% in fiscal 2021, 2020 and 2019.

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