Stockholders' Equity (Schedule Of Stock Options Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2011		Aug. 31, 2009
Stockholders' Equity
Shares Available for Grant, Beginning Balance	10,480,001
Options Outstanding, Beginning Balance	13,154,272		0
Aggregate Intrinsic Value, Beginning Balance	$ 95
Weighted-Average Exercise Price, Beginning Balance	$ 24.10
Weighted-Average Remaining Contractual Life (years), Beginning Balance	4.09
Shares Available for Grant, Options authorized	8,850,000
Shares Available for Grant, Options expired	(829,611)
Weighted-Average Exercise Price, Options expired	$ 31.62
Shares Available for Grant, Options cancelled	1,243,764
Options Outstanding, Options cancelled	(1,243,764)
Weighted-Average Exercise Price, Options cancelled	$ 25.56
Shares Available for Grant, Restricted stock awards	(4,682,981)	[1]
Options Outstanding, Options exercised	(1,437,475)
Weighted-Average Exercise Price, Options exercised	$ 14.45
Shares Available for Grant, Ending Balance	9,164,425
Options Outstanding, Ending Balance	10,473,033		0
Weighted-Average Exercise Price, Ending Balance	$ 24.76
Aggregate Intrinsic Value, Ending Balance	4,029
Weighted-Average Remaining Contractual Life (years), ending Balance	3.70
Options Outstanding, Exercisable	10,345,387
Aggregate Intrinsic Value, Exercisable	$ 3,832
Weighted-Average Exercise Price, Exercisable	$ 24.85
Weighted-Average Remaining Contractual Life (years), Exercisable	3.70
Shares no longer available for grant due to terminated 2002 Stock Plan	(5,896,748)

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