The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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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 vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

+ References

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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

-Publisher FASB

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Employee Stock Option And Retirement Plans (Schedule Of Exercise Price Ranges Of Outstanding And Exercisable Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2009	Aug. 31, 2008
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range of stock options, lower range	$ 35.80
Exercise price range of stock options, upper range	$ 103.30
Number of Shares, Outstanding	6,132	6,451	7,553	8,916
Shares Outstanding, Weighted Average Remaining Years of Contractual Life	4.28
Number of Shares Outstanding, Weighted Average Exercise Price Per Share	$ 57.28	$ 47.73	$ 39.51	$ 40.11
Aggregate Intrinsic Value, Outstanding	$ 187,774
Number of Shares Exercisable	2,643	3,331	4,554
Number of Shares Exercisable, Weighted Average Exercise Price Per Share	$ 38.99	$ 34.49	$ 28.78
Aggregate Intrinsic Value, Exercisable	129,277
$14.97 - $29.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range of stock options, lower range	$ 14.97
Exercise price range of stock options, upper range	$ 29.99
Number of Shares, Outstanding	1,121
Shares Outstanding, Weighted Average Remaining Years of Contractual Life	2.31
Number of Shares Outstanding, Weighted Average Exercise Price Per Share	$ 23.93
Aggregate Intrinsic Value, Outstanding	71,721
Number of Shares Exercisable	1,121
Number of Shares Exercisable, Weighted Average Exercise Price Per Share	$ 23.93
Aggregate Intrinsic Value, Exercisable	71,721
$30.00 - $49.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range of stock options, lower range	$ 30.00
Exercise price range of stock options, upper range	$ 49.99
Number of Shares, Outstanding	1,058
Shares Outstanding, Weighted Average Remaining Years of Contractual Life	2.94
Number of Shares Outstanding, Weighted Average Exercise Price Per Share	$ 40.69
Aggregate Intrinsic Value, Outstanding	49,968
Number of Shares Exercisable	891
Number of Shares Exercisable, Weighted Average Exercise Price Per Share	$ 41.33
Aggregate Intrinsic Value, Exercisable	41,483
$50.00 - $66.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range of stock options, lower range	$ 50.00
Exercise price range of stock options, upper range	$ 66.45
Number of Shares, Outstanding	1,285
Shares Outstanding, Weighted Average Remaining Years of Contractual Life	3.95
Number of Shares Outstanding, Weighted Average Exercise Price Per Share	$ 62.84
Aggregate Intrinsic Value, Outstanding	32,208
Number of Shares Exercisable	618
Number of Shares Exercisable, Weighted Average Exercise Price Per Share	$ 62.34
Aggregate Intrinsic Value, Exercisable	15,795
$66.46 - $79.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range of stock options, lower range	$ 66.46
Exercise price range of stock options, upper range	$ 79.99
Number of Shares, Outstanding	1,689
Shares Outstanding, Weighted Average Remaining Years of Contractual Life	5.41
Number of Shares Outstanding, Weighted Average Exercise Price Per Share	$ 66.91
Aggregate Intrinsic Value, Outstanding	35,437
Number of Shares Exercisable	13
Number of Shares Exercisable, Weighted Average Exercise Price Per Share	$ 66.56
Aggregate Intrinsic Value, Exercisable	278
$80.00 - $103.30 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range of stock options, lower range	$ 80.00
Exercise price range of stock options, upper range	$ 103.30
Number of Shares, Outstanding	979
Shares Outstanding, Weighted Average Remaining Years of Contractual Life	6.49
Number of Shares Outstanding, Weighted Average Exercise Price Per Share	$ 89.50
Aggregate Intrinsic Value, Outstanding	(1,560)
Number of Shares Exercisable	0
Number of Shares Exercisable, Weighted Average Exercise Price Per Share	$ 0.00
Aggregate Intrinsic Value, Exercisable	$ 0