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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2013
May 31, 2012
Inventory [Line Items]    
Raw materials $ 16,587 $ 13,997
Work-in-process 3,583 2,110
Finished and purchased finished goods 18,145 18,885
Inventories $ 38,315 $ 34,992