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Basis of Presentation (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2012
May 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 18,436 $ 19,138
Work in process 12,452 13,052
Finished goods 210,811 219,015
Inventories, net $ 241,699 $ 251,205