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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) |  | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 22, 2017 | Apr. 30, 2018 | Jan. 31, 2018 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Income Taxes |  |  |  |  |  |
U.S. federal statutory income tax rate (as a percent) | 35.00% | 21.00% | 35.00% | 21.00% | 21.00% | 30.40%
Deferred tax expense |  |  |  |  |  | $ 3,300,000

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