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Earnings (Loss) Per Share (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015
Earnings (Loss) Per Share (Details) [Line Items] |  |  |
Number of potentially antidilutive shares outstanding | 0.4 |  |
Options outstanding (Shares) | 2,693,824 | 3,025,046 |
Remaining authorized repurchase amount | $ 38.6 |  |
Participating Restricted Stock Units [Member] |  |  |
Earnings (Loss) Per Share (Details) [Line Items] |  |  |
Undistributed Earnings Allocated to Participating Securities (in Dollars) | $ 0.1 | $ 0.1 | $ 0.1

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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