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Stockholders' Equity (Restricted Stock Activity) (Details)
12 Months Ended
Aug. 31, 2018
$ / shares
shares
Shares  
Outstanding as of beginning of period (in shares) 11,652,319
Changes during the period  
Shares granted (in shares) 2,751,300
Shares vested (in shares) (2,727,229)
Shares forfeited (in shares) (3,324,083)
Outstanding as of end of period (in shares) 8,352,307
Weighted- Average Grant-Date Fair Value  
Outstanding as of beginning of period (in dollars per share) | $ / shares $ 22.00
Changes during the period  
Shares granted (in dollars per share) | $ / shares 29.40
Shares vested (in dollars per share) | $ / shares 22.95
Shares forfeited (in dollars per share) | $ / shares 19.20
Outstanding as of end of period (in dollars per share) | $ / shares $ 24.34
Time-based restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units awarded 1,400,000
Performance-based restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units awarded 400,000
Market-based restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units awarded 400,000