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Stock-Based Compensation (Restricted Stock Activity) (Details 3)
6 Months Ended
Feb. 29, 2016
$ / shares
shares
Number of unvested shares  
Shares, unvested beginning balance | shares 11,931,585
Shares, unvested ending balance | shares 15,055,115
Changes during the period  
Shares granted | shares 5,318,590 [1]
Shares vested | shares (1,747,278)
Shares forfeited | shares (447,782)
Weighted-Average Grant-Date Fair Value  
Weighted-Average Grant-Date Fair Value, beginning balance | $ / shares $ 19.44
Weighted-Average Grant-Date Fair Value, ending balance | $ / shares 21.09
Changes during the period  
Weighted-Average Grant-Date Fair Value, Shares granted | $ / shares 24.08 [1]
Weighted-Average Grant-Date Fair Value, Shares vested | $ / shares 19.16
Weighted-Average Grant-Date Fair Value, Shares forfeited | $ / shares $ 20.25
[1] For those shares granted that are based on the achievement of certain performance criteria, represents the maximum number of shares that can vest.