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Treasury Stock - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 16 Months Ended
Nov. 30, 2016
Nov. 30, 2016
Nov. 30, 2016
Jul. 22, 2015
Stockholders' Equity Attributable to Parent [Abstract]        
Increase in authorized amount of stock to be repurchased       $ 50.0
Treasury stock acquired $ 6.0 $ 6.0 $ 10.5