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Capital Stock and Stock-Based Awards (Details) - Schedule of employee stock purchase plan activity - Employee Stock Purchase Plan [Member] - $ / shares
12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued 42,799 43,141 55,501
Weighted average purchase price per share (in Dollars per share) $ 35.58 $ 33.65 $ 31.98