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Basis of Presentation (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2011
May 31, 2011
Basis of Presentation    
Raw materials $ 17,340 $ 16,900
Work in process 14,407 18,907
Finished goods 256,203 213,851
Inventories, net $ 287,950 $ 249,658