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Earnings (Loss) Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Remaining authorized stock repurchase amount $ 59.9   $ 59.9  
Participating Restricted Stock Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Earnings excluded $ 0.1 $ 0.1 $ 0.1 $ 0.1
Stock Compensation Plans        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive securities excluded (in shares)     0.2