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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Current tax expense:      
Federal $ 974 $ 759 $ 907
State and local 117 151 168
Foreign 1,122 1,348 917
Total current tax expense 2,213 2,258 1,992
Deferred tax expense (benefit):      
Federal (431) (187) 27
State and local 98 (70) 26
Foreign (18) (256) (62)
Total deferred tax benefit (351) (513) (9)
Net income tax expense $ 1,862 $ 1,745 $ 1,983