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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2014
Apr. 30, 2013
Inventory Disclosure [Abstract]    
Finished products $ 3,258 $ 4,052
Work in process 1,263 1,678
Raw materials 7,986 7,473
Total inventories $ 12,507 $ 13,203