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Summary of Restricted Stock Activity (Detail) (USD $)
6 Months Ended
Feb. 28, 2013
Number of non-vested shares  
Shares, non-vested beginning balance 12,945,864
Changes during the period  
Shares granted 3,557,984 [1]
Shares vested (4,426,886)
Shares forfeited (249,099)
Shares, non-vested ending balance 11,827,863
Weighted-Average Grant-Date Fair Value  
Weighted-Average Grant-Date Fair Value, beginning balance $ 16.33
Changes during the period  
Weighted-Average Grant-Date Fair Value, Shares granted $ 17.64 [1]
Weighted-Average Grant-Date Fair Value, Shares vested $ 15.11
Weighted-Average Grant-Date Fair Value, Shares forfeited $ 17.72
Weighted-Average Grant-Date Fair Value, ending balance $ 17.15
[1] For those shares granted that are based on the achievement of certain performance criteria, represents the maximum number of shares that can vest.