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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2013
May 31, 2012
Inventory Disclosure [Line Items]    
Raw Materials $ 18,140 $ 13,997
Work-in-process 3,823 2,110
Finished and purchased goods 19,119 18,885
Inventories $ 41,082 $ 34,992