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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
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May 31, 2018 | May 31, 2017 | May 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued | 50,516 | 42,799 | 43,141
Weighted average purchase price per share (in Dollars per share) | $ 33.74 | $ 35.58 | $ 33.65

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