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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2014
May 31, 2014
Inventory [Line Items]    
Raw Materials $ 22,121 $ 21,515
Work-in-process 4,206 3,681
Finished and purchased goods 28,760 25,982
Inventories $ 55,087 $ 51,178