Stock-Based Compensation (Details) - Schedule of stock-based compensation (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 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	0.1	0.1	0.5	0.3
Stock option expense	$ 3.8us-gaap_StockOptionPlanExpense	$ 4.4us-gaap_StockOptionPlanExpense	$ 4.6us-gaap_StockOptionPlanExpense	$ 4.6us-gaap_StockOptionPlanExpense
Restricted stock unit expense	0.6us-gaap_RestrictedStockExpense	1.2us-gaap_RestrictedStockExpense	1.3us-gaap_RestrictedStockExpense	1.9us-gaap_RestrictedStockExpense
Stock-based compensation expense	5.1us-gaap_ShareBasedCompensation	5.6us-gaap_ShareBasedCompensation	6.6us-gaap_ShareBasedCompensation	6.7us-gaap_ShareBasedCompensation
Management Stock Purchase Plan
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	0.6	0	0.6	0.1
Employee Stock Purchase Plan
Stock-Based Compensation (Details) - Schedule of stock-based compensation [Line Items]
Stock-based compensation expense	$ 0.1	$ 0	$ 0.1	$ 0.1

Share-based payment awards, options, by number of shares issued from Treasury Stock

No definition available.

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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

+ Details

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- Details

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- Details

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