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Capital Stock and Stock-Based Awards (Details) - Schedule of Stock Unit and Restricted Stock Unit activity (Stock Units And Restricted Stock Units [Member], USD $)
12 Months Ended
May 31, 2014
Stock Units And Restricted Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested (Shares) as of May 31, 2013 559,403
Granted (Shares) 68,497
Vested (Shares) (295,572)
Forfeited (Shares) (9,834)
Nonvested (Shares) as of May 31, 2014 322,494
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Nonvested as of May 31, 2013 (in Dollars per share) $ 29.98
Granted (in Dollars per share) $ 30.07
Vested (in Dollars per share) $ 16.84
Forfeited (in Dollars per share) $ 28.90
Nonvested as of May 31, 2014 (in Dollars per share) $ 21.33