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Capital Stock and Stock-Based Awards (Tables)
 12 Months Ended
May 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]  
Schedule Of Capital Stock [Table Text Block] Capital stock consisted of the following as of May 31, 2013:

    Class A Stock     Common Stock     Preferred Stock  
                   
Authorized     4,000,000       70,000,000       2,000,000  
                         
Reserved for Issuance     1,499,000       8,052,806       —  
                         
Outstanding     1,656,200       30,105,479       —  
Schedule of Share-based Compensation, Activity [Table Text Block] The following table sets forth the intrinsic value of stock options exercised, pretax stock-based compensation cost and related tax benefits for the Class A Stock and Common Stock plans for the fiscal years ended May 31:

    2013     2012     2011  
                   
Total intrinsic value of stock options exercised   $ 2.3     $ 5.0     $ 0.4  
                         
Stock-based compensation cost (pretax)   $ 6.3     $ 12.2     $ 13.7  
                         
Tax benefits related to stock-based compensation cost   $ 0.8     $ 1.8     $ 1.8  
                         
Weighted average grant date fair value per option   $ 9.77     $ 9.30     $ 8.15  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] The following table sets forth the stock option activity for the Class A Stock and Common Stock plans for the fiscal year ended May 31, 2013:

    Options     Weighted
Average
Exercise Price 		    Average
Remaining
Contractual
Term (in
years) 		    Aggregate
Intrinsic Value 		 
                         
Outstanding at May 31, 2012     4,948,075     $ 29.69                  
Granted     86,614     $ 31.96                  
Exercised     (475,432 )   $ 27.29                  
Expired     (348,840 )   $ 35.89                  
Cancellations and forfeitures     (24,937 )   $ 32.72                  
                                 
Outstanding at May 31, 2013     4,185,480     $ 29.49       4.8     $ 9.7  
Exercisable at May 31, 2013     3,370,439     $ 30.25       4.0     $ 6.5  
                                 
Schedule Of Restricted Stock Units Activity [Table Text Block] The following table sets forth the RSU activity for the fiscal years ended May 31:

    2013     2012     2011  
RSUs granted     125,584       205,620       141,600  
                         
Weighted average grant date price per unit   $ 23.05     $ 27.92     $ 25.03  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] The following table sets forth the MSPP RSU activity for the fiscal years ended May 31:

    2013     2012  
MSPP RSUs allocated     87,317       22,486  
                 
Purchase price per unit   $ 19.73     $ 17.78  
Schedule Of Nonvested Stock Unit And Restricted Stock Units Activity [Table Text Block] The following table sets forth Stock Unit and RSU activity for the year ended May 31, 2013:

    Stock Units/RSUs     Weighted
Average grant
date fair value 		 
             
Nonvested as of May 31, 2012     710,895     $ 22.81  
Granted     125,584     $ 23.05  
Vested     (242,433 )   $ 26.53  
Forfeited     (34,643 )   $ 26.85  
                 
Nonvested as of May 31, 2013     559,403     $ 29.98  
                 
Schedule Of Employee Stock Purchase Plan Share Activity [Table Text block] The following table sets forth the ESPP share activity for the fiscal years ended May 31:

    2013     2012  
Shares issued     68,228       54,967  
                 
Weighted average purchase price per share   $ 24.78     $ 23.45