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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Current tax expense (benefit):    
Federal $ 1,899 $ (396)
State and local 490 8
Foreign 1,008 1,136
Total current tax expense (benefit) 3,397 748
Deferred tax expense (benefit):    
Federal 0 449
State and local 0 (135)
Foreign 121 (72)
Total deferred tax expense 121 242
Net income tax expense $ 3,518 $ 990