Restricted Stock Activity (Detail) (USD $)	12 Months Ended
	Aug. 31, 2014
Number of unvested shares
Shares, unvested beginning balance	11,335,192
Changes during the period
Shares granted	4,335,854	[1]
Shares vested	(5,120,099)
Shares forfeited	(750,005)
Shares, unvested ending balance	9,800,942
Weighted-Average Grant-Date Fair Value
Weighted-Average Grant-Date Fair Value, beginning balance	$ 17.15
Changes during the period
Weighted-Average Grant-Date Fair Value, Shares granted	$ 21.84
Weighted-Average Grant-Date Fair Value, Shares vested	$ 15.46
Weighted-Average Grant-Date Fair Value, Shares forfeited	$ 19.97
Weighted-Average Grant-Date Fair Value, ending balance	$ 19.89

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