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Earnings Per Share (Details) - shares
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Earnings Per Share [Abstract]      
Basic weighted average shares outstanding (in shares) 36,161,383 35,683,139 35,135,689
Effect of dilutive securities (shares) 0 0 304,161
Diluted weighted average shares outstanding (in shares) 36,161,383 35,683,139 35,439,850
Securities excluded as their inclusion would be anti-dilutive (shares) 3,277,037 2,862,414 2,347,426