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Restricted Stock Activity (Detail) (USD $)
12 Months Ended
Aug. 31, 2013
Number of non-vested shares  
Shares, non-vested beginning balance 12,945,864
Changes during the period  
Shares granted 3,686,694 [1]
Shares vested (4,504,249)
Shares forfeited (793,117)
Shares, non-vested ending balance 11,335,192
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 $ 17.67 [1]
Weighted-Average Grant-Date Fair Value, Shares vested $ 15.16
Weighted-Average Grant-Date Fair Value, Shares forfeited $ 17.36
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.