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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Current tax expense:      
Federal $ 891 $ 974 $ 759
State and local 120 117 151
Foreign 1,467 1,122 1,348
Total current tax expense 2,478 2,213 2,258
Deferred tax expense (benefit):      
Federal (108) (431) (187)
State and local 24 98 (70)
Foreign (268) (18) (256)
Total deferred tax benefit (352) (351) (513)
Net income tax expense $ 2,126 $ 1,862 $ 1,745