Aggregate number of common shares reserved for future issuance.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

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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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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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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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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).

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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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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)(c)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph c(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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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- Definition

Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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-Name Accounting Standards Codification

-Topic 505

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

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-Topic 505

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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Total cost of shares repurchased divided by the total number of shares repurchased.

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 1

-Section B

-Paragraph 7

-Subparagraph b

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Note 14. Stock-Based Compensation (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended			3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended	3 Months Ended	6 Months Ended		3 Months Ended				6 Months Ended			3 Months Ended		0 Months Ended
	Feb. 29, 2012	Nov. 30, 2011	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011	Aug. 31, 2011	Feb. 29, 2012 Employee Stock Purchase Plan [Member]	Feb. 28, 2011 Employee Stock Purchase Plan [Member]	May 31, 2010 Employee Stock Purchase Plan [Member]	Feb. 29, 2012 Employee Stock Purchase Plan [Member]	Feb. 28, 2011 Employee Stock Purchase Plan [Member]	Feb. 29, 2012 Employee Stock Purchase Plan [Member]	Feb. 28, 2011 Employee Stock Purchase Plan [Member]	Feb. 29, 2012 Employee Stock Purchase Plan [Member]	Feb. 28, 2011 Employee Stock Purchase Plan [Member]	Nov. 08, 2010 November 8, 2010 Restricted Stock [Member]	Nov. 30, 2011 Non-Performance Based [Member]	Feb. 29, 2012 Non-Performance Based [Member]	Feb. 28, 2011 Non-Performance Based [Member]	Feb. 29, 2012 Performance Based [Member]	Nov. 30, 2011 Performance Based [Member]	May 31, 2011 Performance Based [Member]	Feb. 28, 2011 Performance Based [Member]	Feb. 29, 2012 Performance Based [Member]	Feb. 28, 2011 Performance Based [Member]	May 31, 2011 Non-Employee Directors' Stock Option Plan [Member]	Feb. 29, 2012 Non-Employee [Member]	Feb. 29, 2012 Robin A Abrams [Member]	Nov. 08, 2010 November 8, 2010 Restricted Units [Member]	Jan. 27, 2011 January 27, 2011 Restricted Stock [Member]	Jan. 27, 2011 January 27, 2011 Restricted Units [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 48,600			$ 48,600
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition				3.3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures (in Shares)																117,723	420,000	419,593	84,811	65,224	666,000			665,551	809,239		20,976	5,244		1,719	366
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 94.84			$ 94.84													$ 94.84	$ 94.84	$ 88.40	$ 99.78	$ 94.84			$ 99.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 29.07	$ 32.08	$ 24.47							$ 15.97	$ 14.97	$ 15.69	$ 13.65					$ 32.08		$ 29.07	$ 24.42				$ 24.79
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)							237,682			237,682																250,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 0	$ 0							$ 26.87
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 71.30	$ 71.31		$ 71.30		$ 71.31										$ 84.38													$ 83.49	$ 94.50	$ 95.24
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	0	0																											3,291
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)				364,000	925,000		19,690	16,872	16,872	42,856	38,606
Treasury Stock Acquired, Average Cost Per Share							$ 74.29	$ 77.09	$ 77.09	$ 73.95	$ 70.23