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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Apr. 30, 2012
Summary of Accrued Expenses    
Accrued distributor incentives $ 6,491 $ 5,453
Accrued rebates and promotions 3,279 2,862
Accrued employee benefits 1,950 1,902
Accrued professional fees 1,942 3,682
Accrued commissions 1,711 1,235
Interest payable 1,567 1,783
Accrued workers' compensation 949 766
Accrued utilities 431 436
Current portion of capital lease obligation 430 418
Accrued severance/restructuring costs 237 345
Accrued other 1,323 1,803
Total accrued expenses $ 20,310 $ 20,685