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Significant Accounting Policies (Inventories) (Details) (USD $)
May 31, 2014
May 31, 2013
Accounting Policies [Abstract]    
Raw materials $ 17,984,000 $ 19,800,000
Work in process 14,304,000 17,353,000
Finished goods 218,951,000 203,287,000
Inventories, net 251,239,000 240,440,000
Inventory valuation reserves $ 30,700,000 $ 29,500,000