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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Current tax expense:      
Federal $ 759 $ 907 $ 941
State and local 151 168 184
Foreign 1,348 917 791
Total current tax expense 2,258 1,992 1,916
Deferred tax expense (benefit):      
Federal (187) 27 (346)
State and local (70) 26 (24)
Foreign (256) (62) (6)
Total deferred tax benefit (513) (9) (376)
Net income tax expense $ 1,745 $ 1,983 $ 1,540