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Earnings (Loss) Per Share (Details)
shares in Millions, $ in Millions
9 Months Ended
Feb. 29, 2016
USD ($)
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Remaining authorized stock repurchase amount | $ $ 52.9
Stock Compensation Plans  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Potentially dilutive securities excluded (in shares) | shares 0.0