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Share-Based Compensation - Stock Options (Details) - Stock Options - USD ($)
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Common Stock Options (in shares)    
Outstanding at the beginning of the period: (in shares) 2,232,000 2,287,000
Granted (in shares) 0 0
Exercised (in shares) (44,000) 0
Expired of forfeited (in shares) 0 0
Outstanding at the end of the period: (in shares) 2,188,000 2,287,000
Weighted Average Exercise Price (in dollar per share)    
Outstanding at the beginning of period: (in dollars per share) $ 13.21 $ 13.13
Granted (in dollars per share) 0.00 0.00
Exercised (in dollars per share) 9.89 0.00
Expired or forfeited (in dollars per share) 0.00 0.00
Outstanding at the end of period: (in dollars per share) $ 13.28 $ 13.13
Unrecognized compensation costs $ 0  
Recognized share-based compensation expense (less than) $ 0 $ 100,000