Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
In Millions
12 Months Ended
May 31, 2011
May 31, 2010
May 31, 2009
Commitments and Contingencies (Textuals) [Abstract]      
Lines of credit outstanding $ 0    
Irrevocable standby letters of credit 47.4 50.3  
Irrevocable stand by letters of credit outstanding 0    
Expiry date range of letter of credit July 2011 to December 2011    
Rent expense 45.4 46.9 46.6
Minimum future payment obligations under purchase orders and contractual arrangements 72.4    
Commitments to purchase capital assets 6.0    
JP Morgan Chase Bank, N.A. [Member]
     
Lines of credit      
Amount available 350    
Expiration date February 2012    
Bank of America, N.A. [Member]
     
Lines of credit      
Amount available 250    
Expiration date February 2012    
PNC Bank, National Association [Member]
     
Lines of credit      
Amount available 150    
Expiration date February 2012    
Wells Fargo Bank, National Association [Member]
     
Lines of credit      
Amount available $ 150    
Expiration date February 2012