Stock-Based Compensation (Summary Of Stock Option And Stock Appreciation Right Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Feb. 29, 2012
Stock-Based Compensation [Abstract]
Shares Available for Grant, Balance at August 31, 2011	9,164,425
Shares Available for Grant, Options cancelled	357,491
Shares Available for Grant, Options expired	(53,274)
Shares Available for Grant, Restricted stock awards	(4,994,492)	[1]
Shares Available for Grant, Balance at February 29, 2012	4,474,150
Options Outstanding, Balance at August 31, 2011	10,473,033
Options Outstanding, Options cancelled	(357,491)
Options Outstanding, Options exercised	(807,371)
Options Outstanding, Balance at February 29, 2012	9,308,171
Options Outstanding, Exercisable at February 29, 2012	9,283,523
Aggregate Intrinsic Value, Balance at August 31, 2011	$ 4,029
Aggregate Intrinsic Value, Balance at February 29, 2012	17,092
Aggregate Intrinsic Value, Exercisable at February 29, 2012	$ 16,772
Weighted-Average Exercise Price, Balance at August 31, 2011	$ 24.76
Weighted-Average Exercise Price, Options expired	$ 15.23
Weighted-Average Exercise Price, Options cancelled	$ 26.21
Weighted-Average Exercise Price, Options exercised	$ 16.43
Weighted-Average Exercise Price, Balance at February 29, 2012	$ 25.49
Weighted-Average Exercise Price, Exercisable at February 29, 2012	$ 25.52
Weighted-Average Remaining Contractual Life (years), Balance at August 31, 2011	3.70
Weighted-Average Remaining Contractual Life (years), Balance at February 29, 2012	3.35
Weighted-Average Remaining Contractual Life (years), Exercisable at February 29, 2012	3.34

[1] Represents the maximum number of shares that can be issued based on the achievement of certain performance criteria.