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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, 2015
May. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued 55,501 57,835
Weighted average purchase price per share (in Dollars per share) $ 31.98 $ 26.92