Closing market price of common stock

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- Definition

Employee service share based compensation unrecognized compensation cost expected to be recognized in year five.

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- Definition

Employee service share based compensation unrecognized compensation cost expected to be recognized in year four.

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- Definition

Employee service share based compensation unrecognized compensation cost expected to be recognized in year one.

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- Definition

Employee service share based compensation unrecognized compensation cost expected to be recognized in year three.

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- Definition

Employee service share based compensation unrecognized compensation cost expected to be recognized in year two.

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- Definition

Increase In Liabilities For Stock Based Compensation As Result Of Changes In Stock Price

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No definition available.

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- Definition

Reduction in liabilities for stock-based compensation as a result of changes in stock price.

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No definition available.

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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 50

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-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

-Section F

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer).

+ References

No definition available.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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- Definition

The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Paragraph A240

-Subparagraph b(2)(b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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-Topic 718

-SubTopic 10

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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- Definition

As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options that are exercisable.

+ References

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- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2011	Nov. 30, 2010	May 31, 2011
Options expiration date			ten years
Shares available for future awards	652,612		652,612
Closing market price of common stock			$ 25.33
Aggregate intrinsic value of stock options outstanding	$ 1.9		$ 1.9
Aggregate intrinsic value of exercisable stock options	1.8		1.8
Total intrinsic value of options exercised	0.1	0.2	0.1	0.3
Accrued stock-based compensation	3.0		3.0		6.8
Common stock reserved for the settlement of stock-based compensation	2,600,000		2,600,000		2,600,000
Liabilities reduced stock-based compensation	2.7		3.8
Liabilities increased stock-based compensation		1.5		0.1
Tax expense or benefit recognized in statements of operations for stock-based compensation	0.1	0.7	0.1	0.4
Cash tax benefit realized on stock-based compensation		0	0
Total unrecognized compensation cost related to stock options, restricted stock payments, and stock awards	9.4		9.4
Unrecognized compensation cost related to stock options expected to be recognized, 2012			3.4
Unrecognized compensation cost related to stock options expected to be recognized, 2013			2.7
Unrecognized compensation cost related to stock options expected to be recognized, 2014			2.0
Unrecognized compensation cost related to stock options expected to be recognized, 2015			1.1
Unrecognized compensation cost related to stock options expected to be recognized, 2016			0.2
Stock Appreciation Rights [Member]
Stock-based compensation, vested	133,315		133,315
Deferred Compensation Agreements To Be Settled In Cash [Member]
Stock-based compensation, vested	101,790		101,790
Deferred Compensation Agreements To Be Settled In Stock [Member]
Stock-based compensation, vested	2,303		2,303
Restricted Stock [Member]
Stock-based compensation	8,834		8,834
Stock Compensation Plan [Member]
Stock-based compensation	2,323		2,323
Selling, General And Administrative Expense [Member]
Stock-based compensation included in selling, general and administrative expense	$ (1.3)	$ 2.5	$ (1.2)	$ 2.3