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Earnings Per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2017
Nov. 30, 2016
Earnings Per Share [Abstract]        
Anti-dilutive options not included in the computation of diluted earnings per share 44.5 31.4 44.5 31.4