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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Current tax expense (benefit):    
Federal $ (571) $ 1,719
State and local (75) 311
Foreign 1,065 1,414
Total current tax expense 419 3,444
Deferred tax expense (benefit):    
Federal 30 442
State and local 59 33
Foreign (62) 242
Total deferred tax expense (benefit) 27 717
Net income tax expense $ 446 $ 4,161