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Share-based Compensation - Performance Share Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 10 $ 15 $ 11
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 2 $ 6 $ 3
Compensation Cost Not yet Recognized $ 2    
Compensation Cost Not yet Recognized, Period for Recognition 6 months 22 days    
Number of Shares:      
Outstanding, Beginning Balance 623 573 446
Granted 269 220 267
Vested (98) (62) (98)
Forfeited (159) (108) (42)
Outstanding, Ending Balance 635 623 573
Weighted Average Grant Date Fair Value:      
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance $ 27.93 $ 32.47 $ 38.33
Granted, Weighted Average Grant Date Fair Value 24.02 30.55 28.48
Vested, Weighted Average Grant Date Fair Value 26.27 55.43 47.10
Forfeited, Weighted Average Grant Date Fair Value 26.36 41.48 35.21
Nonvested, Weighted Average Grant Date Fair Value, Ending Balance 26.92 27.93 32.47
Performance Shares | Class A Common Stock      
Common Stock Fair Value:      
Common Stock Fair Value [1] $ 23.60 $ 28.87 $ 28.51
August 13, 2013 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Grant Date   Aug. 13, 2013  
Share Based Compensation Weight Based on EBITDA Used in Calculation of Performance Targets   50.00%  
Share Based Compensation Weight Based on Return on Equity Used in Calculation of Performance Targets   50.00%  
Award Vesting Period   2 years  
August 13, 2013 | Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Award Payouts Threshold   50.00%  
August 13, 2013 | Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Award Payouts Threshold   200.00%  
November 21, 2013 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Grant Date   Nov. 21, 2013  
Share Based Compensation Weight Based on Divisional Volume Metrics Used In Calculation Of Performance Targets   50.00%  
Share Based Compensation Weight Based on Divisional Operating Income Metrics Used In Calculation Of Performance Targets   50.00%  
November 21, 2013 | Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Award Payouts Threshold   50.00%  
November 21, 2013 | Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Award Payouts Threshold   200.00%  
November 25, 2014 | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Grant Date Nov. 25, 2014    
Share Based Compensation Weight Based on EBITDA Used in Calculation of Performance Targets 50.00%    
Share Based Compensation Weight Based on Return on Equity Used in Calculation of Performance Targets 50.00%    
Award Vesting Period 2 years    
November 25, 2014 | Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Award Payouts Threshold 50.00%    
November 25, 2014 | Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Award Payouts Threshold 200.00%    
[1] Amounts represent the weighted average value of the Company’s Class A common stock on the date that the performance share awards vested.