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.

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 14.F)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Accounting for Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013	Jul. 31, 2014	Jun. 30, 2014
Stock options
Stock options, additional disclosures
Total intrinsic value of stock options exercised			$ 1.1	$ 3.7
Compensation expense	0.7	1.0	1.4	1.5
Restricted stock
Stock options, additional disclosures
Granted (in shares)	0
Compensation expense	$ 1.4	$ 1.4	$ 2.7	$ 2.5
Performance-based restricted stock
Stock options, additional disclosures
Granted (in shares)					192,250
Granted (in dollars per share)					$ 26.08
Time-based restricted stock
Stock options, additional disclosures
Granted (in shares)					95,956
Granted (in dollars per share)					$ 26.08
Time-based restricted stock \| Board of Directors
Stock options, additional disclosures
Granted (in shares)						45,000
Granted (in dollars per share)						$ 24.50