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Commitments and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2012
May 31, 2011
May 31, 2010
Commitments and Contingencies (Textual) [Abstract]      
Lines of credit amount outstanding $ 0    
Irrevocable standby letters of credit amount available 46.8 47.4  
Irrevocable stand by letters of credit amount outstanding 0    
Expiry date range of letters of credit July 2012 to December 2012    
Commitments to purchase capital assets 7.6    
Rent expense 43.0 45.4 46.9
Minimum future payment obligations under purchase orders and contractual arrangements $ 88.4