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Earnings (Loss) Per Share (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2017 | May 31, 2016 | May 31, 2018
Earnings (Loss) Per Share (Details) [Line Items] |  |  |
Number of potentially antidilutive shares outstanding |  |  | 0.1
Options outstanding (Shares) | 2,693,824 |  | 2,822,126
Remaining authorized repurchase amount |  |  | $ 61.4
Participating Restricted Stock Units [Member] |  |  |
Earnings (Loss) Per Share (Details) [Line Items] |  |  |
Undistributed Earnings Allocated to Participating Securities (in Dollars) | $ 0.1 | $ 0.1 |

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