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Earnings Per Share - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Earnings Per Share [Abstract]      
Antidilutive shares excluded from calculation of earnings per share     0.1
Earnings attributable to participating RSUs $ 0.2 $ 0.1 $ 0.1
Remaining authorized stock repurchase amount $ 61.4   $ 61.4