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Earnings Per Share (Details) - shares
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Earnings Per Share [Abstract]      
Basic 37,074,797 36,616,859 36,161,383
Effect of dilutive securities 464,603 342,391 0
Diluted 37,539,400 36,959,250 36,161,383
Securities excluded as their inclusion would be anti-dilutive 1,077,256 1,058,790 3,277,037