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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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Share-based Compensation Arrangement by Share-based Payment Award, Antidilutive Securities Outstanding, Amount

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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

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

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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.

+ 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=64863997&loc=SL5780133-109256

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