Stockholders' Equity (Summary Of Restricted Stock Activity) (Details) (USD $)	12 Months Ended
	Aug. 31, 2011
Stockholders' Equity
Non-vested shares, beginning balance	12,189,271
Shares granted	6,176,068	[1]
Shares vested	(2,774,974)
Shares forfeited	(1,493,087)
Non-vested shares, ending balance	14,097,278
Weighted-Average Grant-Date Fair Value, beginning balance	$ 13.13
Weighted-Average Grant-Date Fair Value, Shares granted	$ 14.29	[1]
Weighted-Average Grant-Date Fair Value, Shares vested	$ 16.89
Weighted-Average Grant-Date Fair Value, Shares forfeited	$ 13.05
Weighted-Average Grant-Date Fair Value, ending balance	$ 12.91

[1] For those shares granted that are based on the achievement of certain performance criteria, represents the maximum number of shares that can vest.