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Earnings (Loss) Per Share (Details) - USD ($) $ in Millions	12 Months Ended
	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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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



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Amount remaining of a stock repurchase plan authorized.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



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