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Income Taxes (Schedule of Valuation Allowance) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Additions charged to costs and expenses | $ 3,200 |  |
Deductions | (13,500) |  |
Valuation allowance, decrease in deferred tax asset | 10,300 |  |
Valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, beginning of the year | 45,124 | $ 47,070 | $ 49,215
Additions charged to costs and expenses | 13,492 | 2,151 | 2,302
Deductions | (3,215) | (4,097) | (4,447)
Balance, end of the year | $ 55,401 | $ 45,124 | $ 47,070

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