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Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2013
Apr. 30, 2013
Accrued Expenses [Line Items]    
Accrued rebates and promotions $ 3,056 $ 3,900
Accrued employee benefits 2,214 1,953
Interest payable 2,213 1,542
Accrued professional fees 2,158 2,882
Unrecognized tax benefits 1,053  
Accrued workers' compensation 960 963
Accrued distributor incentives 939 458
Accrued commissions 716 949
Current portion of capital lease obligation 455 442
Accrued severance 258  
Accrued utilities 198 537
Accrued other 1,440 2,407
Total accrued expenses $ 15,660 $ 16,033