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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, 2017 | May 31, 2016 | May 31, 2015 | May 31, 2017 | Jul. 22, 2015
Class of Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Increase in Authorized Amount |  |  |  |  | $ 50.0
Amount of stock repurchased in period | $ 6.9 | $ 14.4 | $ 3.5 | $ 11.4 |
Remaining authorized repurchase amount | $ 38.6 |  |  | $ 38.6 |
Shares of stock repurchased (in shares) | 0.2 |  |  |  |
Average cost of stock repurchased (in Dollars per share) | $ 38.80 |  |  |  |
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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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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