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Stock-Based Compensation (Details) - Schedule of stock-based compensation - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2015 | Nov. 30, 2014 | Nov. 30, 2015 | Nov. 30, 2014
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 5.1 | $ 5.1 | $ 6.5 | $ 6.6
Share-based payment awards, options, by number of shares issued from Treasury Stock | 0.2 | 0.1 | 1.2 | 0.5
Discontinued Operations |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense |  | $ 0.6 |  | $ 0.6
Employee Stock Expense |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 3.8 | 3.8 | $ 4.4 | 4.6
Restricted Stock Unit Expense |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | 0.7 | 0.6 | 1.4 | 1.3
Management Stock Purchase Plan |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | 0.6 | 0.6 | 0.6 | 0.6
Employee Stock Purchase Plan |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 0.0 | $ 0.1 | $ 0.1 | $ 0.1

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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