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Stock-Based Compensation (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2015
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 5.5 | $ 5.1 | $ 7.1 | $ 6.5
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 0.1 | 0.2 | 0.3 | 1.2
Stock option expense |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 4.3 | $ 3.8 | $ 5.1 | $ 4.4
Restricted stock unit expense |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | 0.7 | 0.7 | 1.4 | 1.4
Management stock purchase plan |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | 0.4 | 0.6 | 0.4 | 0.6
Employee stock purchase plan |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 0.1 | $ 0.0 | $ 0.2 | $ 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 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + 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 + Details
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