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Share-based Compensation Performance Share Awards (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 15 $ 11 $ 9
Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 6 3 1
Compensation Cost Not yet Recognized $ 6    
Compensation Cost Not yet Recognized, Period for Recognition 10 months 22 days    
Number of Shares:      
Outstanding, Beginning Balance 573,000 446,000 285,000
Granted 220,000 267,000 278,000
Vested (62,000) (98,000) (54,000)
Forfeited (108,000) (42,000) (63,000)
Outstanding, Ending Balance 623,000 573,000 446,000
Weighted Average Grant Date Fair Value:      
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance $ 32.47 $ 38.33 $ 47.48
Granted, Weighted Average Grant Date Fair Value $ 30.55 $ 28.48 $ 25.98
Vested, Weighted Average Grant Date Fair Value $ 55.43 $ 47.10 $ 25.42
Forfeited, Weighted Average Grant Date Fair Value $ 41.48 $ 35.21 $ 36.53
Nonvested, Weighted Average Grant Date Fair Value, Ending Balance $ 27.93 $ 32.47 $ 38.33
Performance Shares | Class A Common Stock
     
Common Stock Fair Value:      
Common Stock Fair Value $ 28.87 [1] $ 28.51 [1] $ 43.90 [1]
July 24, 2012 | Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Grant Date Jul. 24, 2012    
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    
July 24, 2012 | Performance Shares | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Award Payouts Threshold 50.00%    
July 24, 2012 | Performance Shares | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Based Awards Award Payouts Threshold 200.00%    
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%    
Award Vesting Period 2 years    
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%    
[1] Amounts represent the weighted average value of the Company’s Class A common stock on the date that the performance share awards vested.