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Inventories (Detail) - USD ($)
$ in Thousands
Aug. 31, 2015
May. 31, 2015
Inventory [Line Items]    
Raw Materials $ 24,211 $ 21,605
Work-in-process 4,025 3,972
Finished and purchased goods 27,871 26,024
Inventories $ 56,107 $ 51,601