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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Oct. 31, 2015
Apr. 30, 2015
Inventory Disclosure [Abstract]    
Finished products $ 3,082 $ 2,936
Work in process 1,885 1,422
Raw materials 8,773 8,387
Total inventories $ 13,740 $ 12,745