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Stockholders' Equity (Restricted Stock Activity) (Details 3)
12 Months Ended
Aug. 31, 2016
$ / shares
shares
Number of unvested shares  
Shares, unvested beginning balance | shares 11,931,585
Changes during the period  
Shares granted | shares 5,376,030 [1]
Shares vested | shares (1,817,635)
Shares forfeited | shares (712,802)
Shares, unvested ending balance | shares 14,777,178
Weighted-Average Grant-Date Fair Value  
Weighted-Average Grant-Date Fair Value, beginning balance | $ / shares $ 19.44
Changes during the period  
Weighted-Average Grant-Date Fair Value, Shares granted | $ / shares 24.02 [1]
Weighted-Average Grant-Date Fair Value, Shares vested | $ / shares 19.18
Weighted-Average Grant-Date Fair Value, Shares forfeited | $ / shares 20.5
Weighted-Average Grant-Date Fair Value, ending balance | $ / shares $ 21.09
[1] For those shares granted that are based on the achievement of certain performance criteria, represents the maximum number of shares that can vest.