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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Inventory [Line Items]    
Raw materials $ 21,515 $ 16,587
Work-in-process 3,681 3,583
Finished and purchased finished goods 25,982 18,145
Inventories $ 51,178 $ 38,315