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Schedule II - Valuation and Qualifying Accounts (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 17,875 | $ 14,032 | $ 15,682
Charges to Cost and Expenses | 1,642 | 886 | 5,170
Charges to Other Accounts | 8,119 | 3,939 |
Deductions | (2,463) | (982) | (6,820)
Balance at End of Period | $ 25,173 | $ 17,875 | $ 14,032

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