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Inventories (Detail) - USD ($)
$ in Thousands
Feb. 29, 2016
May. 31, 2015
Inventory [Line Items]    
Raw Materials $ 27,874 $ 21,605
Work-in-process 5,019 3,972
Finished and purchased goods 32,555 26,024
Inventories $ 65,448 $ 51,601