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Basis of Presentation (Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2014
May 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 16,652 $ 17,984
Work in process 13,835 14,304
Finished goods 219,330 218,951
Inventories, net $ 249,817 $ 251,239