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Inventories (Detail) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Inventory [Line Items]    
Raw materials $ 21,605 $ 21,515
Work-in-process 3,972 3,681
Finished and purchased finished goods 26,024 25,982
Inventories $ 51,601 $ 51,178