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Earnings (Loss) Per Share (Details) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Earnings (Loss) Per Share (Details) [Line Items] |  |  |
Options outstanding (Shares) | 4,054,126 | 4,355,367 |
Remaining authorized repurchase amount | $ 9.9 |  |
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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- Definition Amount of undistributed earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 + Details
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