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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] - $ / shares
12 Months Ended
May. 31, 2015
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 322,494
Granted (Shares) 133,173
Vested (Shares) (129,695)
Forfeited (Shares) (9,411)
Nonvested (Shares) as of May 31, 2014 316,561
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) $ 21.33
Granted (in Dollars per share) 21.66
Vested (in Dollars per share) 25.64
Forfeited (in Dollars per share) 30.67
Nonvested as of May 31, 2014 (in Dollars per share) $ 19.85