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Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Payables And Accruals [Abstract]    
Accrued rebates and promotions [1] $ 26,750 $ 7,937
Accrued taxes other than income 7,758 5,931
Accrued employee benefits 4,574 4,326
Accrued professional fees 2,079 2,195
Current portion of capital lease obligation 1,022 1,455
Interest payable 1,361 1,218
Accrued other 8,142 5,385
Total accrued expenses $ 51,686 $ 28,447
[1] The large increase in accrued rebates and promotions relates primarily to a consumer cash rebate promotion that began in April 2017.