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Stock-Based Compensation (Details) - Schedule of stock-based compensation (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2014 | Feb. 28, 2013 | Feb. 28, 2014 | Feb. 28, 2013
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Share-based payment awards, options, by number of shares issued from Treasury Stock |  |  |  | 0.4
Stock option expense | $ 0.8 | $ 0.4 | $ 5.4 | $ 2.0
Restricted stock unit expense | 0.2 | 0.6 | 2.1 | 2.4
Stock-based compensation expense | 1.1 | 1.0 | 7.8 | 5.2
Management Stock Purchase Plan |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | 0 | 0 | 0.1 | 0.6
Employee Stock Purchase Plan |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 0.1 | $ 0 | $ 0.2 | $ 0.2

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- Definition Share-based payment awards, options, by number of shares issued from Treasury Stock + References No definition available. + Details
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- Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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