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Stockholders' Equity (Restricted Stock Activity) (Details 3)
12 Months Ended
Aug. 31, 2015
$ / shares
shares
Number of unvested shares  
Shares, unvested beginning balance | shares 9,800,942
Changes during the period  
Shares granted | shares 5,308,937 [1]
Shares vested | shares (1,706,944)
Shares forfeited | shares (1,471,350)
Shares, unvested ending balance | shares 11,931,585
Weighted-Average Grant-Date Fair Value  
Weighted-Average Grant-Date Fair Value, beginning balance $ 19.89
Changes during the period  
Weighted-Average Grant-Date Fair Value, Shares granted 18.64 [1]
Weighted-Average Grant-Date Fair Value, Shares vested 19.57
Weighted-Average Grant-Date Fair Value, Shares forfeited 19.42
Weighted-Average Grant-Date Fair Value, ending balance $ 19.44
[1] For those shares granted that are based on the achievement of certain performance criteria, represents the maximum number of shares that can vest.