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Summary of Restricted Stock Activity (Detail) (USD $)
3 Months Ended
Nov. 30, 2012
Number of non-vested shares  
Shares, non-vested beginning balance 12,945,864
Changes during the period  
Shares granted 3,503,754 [1]
Shares vested (4,375,806)
Shares forfeited (141,486)
Shares, non-vested ending balance 11,932,326
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 $ 17.60 [1]
Weighted-Average Grant-Date Fair Value, Shares vested $ 15.05
Weighted-Average Grant-Date Fair Value, Shares forfeited $ 17.75
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.