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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) | 12 Months Ended
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Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Income Taxes |  |  |
Increase to income taxes payable | $ 42,788,000 | $ 24,962,000 |
Deferred income taxes | $ 664,000 | $ 1,729,000 |
U.S. federal statutory income tax rate (as a percent) | 21.00% | 21.00% | 21.00%

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