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Treasury Stock (Details) - Schedule of repurchase of common stock - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended | 23 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016 | May 31, 2017 | Mar. 21, 2018 | Jul. 22, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Increase in Authorized Amount |  | $ 100.0 |  | $ 100.0 | $ 50.0 | $ 50.0
Amount of stock repurchased in period | $ 27.2 | $ 6.9 | $ 14.4 | $ 38.6 |  |
Remaining authorized repurchase amount | $ 61.4 |  |  |  |  |
Shares of stock repurchased (in shares) | 0.7 |  |  |  |  |
Average cost of stock repurchased (in Dollars per share) | $ 37.66 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common Stock, par value per share (in Dollars per share) | $ 0.01 | $ 0.01 |  | $ 0.01 |  |

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