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Basis of Presentation (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 16,476 $ 19,800
Work in process 14,256 17,353
Finished goods 225,400 203,287
Inventories, net $ 256,132 $ 240,440