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.

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-Name Staff Accounting Bulletin (SAB)

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- Definition

Aggregate number of common shares reserved for future issuance.

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-Number 129

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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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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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- Definition

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

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- Definition

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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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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- Definition

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

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-Name Accounting Principles Board Opinion (APB)

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-Name Regulation S-X (SX)

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-Paragraph 29, 30

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Note 14. Stock-Based Compensation (Detail) (USD $)	1 Months Ended			3 Months Ended
Note 14. Stock-Based Compensation (Detail) (USD $)	Nov. 30, 2012	Jul. 31, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011	Dec. 16, 2008
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 53,700,000			$ 53,700,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition				3 years 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	1,011,510	241,546	665,551	1,646,818
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)						500,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)				333,000	209,000
Share-based Compensation (in Dollars)				5,203,000	5,880,000
Non-Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)				635,308
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 92.22	$ 94.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 26.87	$ 32.08
Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)				1,011,510
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 92.22	$ 94.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 26.87	$ 32.08
Non-Employee Directors' Stock Option Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)	250,000			250,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 78.53	$ 73.66
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 15.74	$ 15.46
Common Stock, Capital Shares Reserved for Future Issuance (in Shares)	176,949			176,949
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)				18,102	23,166
Share-based Compensation (in Dollars)				300,000	400,000
Employee Stock Purchase Plan [Member]
Allocated Share-based Compensation Expense (in Dollars)				$ 5,200,000	$ 5,900,000
Non-Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)					419,593
Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)					665,551