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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Current tax expense:    
Federal $ 691 $ 1,899
State and local 197 490
Foreign 1,736 1,008
Total current tax expense 2,624 3,397
Deferred tax expense:    
Federal 0 0
State and local 0 0
Foreign 515 121
Total deferred tax expense 515 121
Net income tax expense $ 3,139 $ 3,518