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Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018
Change in Unrecognized Tax Benefits |  |
Balance at beginning of year | $ 928 | $ 28
Additions based on tax positions related to the current year | 120 | 0
Additions for tax positions of prior years | 1,192 | 0
Acquisitions, divestures, and other | 0 | 900
Balance at end of year | $ 2,240 | $ 928

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