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Share-based Compensation (Details) (USD $)
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 9,000,000 $ 14,000,000 $ 11,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding, Beginning Balance 319,000 338,000 377,000  
Weighted Average Exercise Price $ 31.94 $ 28.50 $ 28.51 $ 28.32
Weighted Average Remaining Contractual Term 3.9 3.9 4.8 5.6
Aggregate Intrinsic Value 459,000 [1] 5,430,000 [1] 5,324,000 [1] 9,683,000 [1]
Granted 323,000 0 0  
Weighted Average Grant Date Fair Value $ 34.75      
Exercised (25,000) (19,000) (36,000)  
Exercises, Weighted Average Exercise Price $ 24.03 $ 28.70 $ 26.08  
Forfeitured/Canceled (5,000)   (3,000)  
Forfeitured/Canceled, Weighted Average Exercise Price $ 34.59   $ 34.46  
Outstanding, Ending Balance 612,000 319,000 338,000  
Share based Compensation Arrangement by Share based Payment Award, Options, Grants in Period, Total Fair Value 3,000,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number 322,658      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value   1,000,000 1,000,000  
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 146,481 135,255 153,986  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vesting Percent 20.00%      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Total Fair Value 6,000,000 7,000,000 7,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Outstanding, Beginning Balance 348,000 311,000 261,000  
Weighted Average Grant Date Fair Value $ 49.46 $ 54.06 $ 53.55 $ 56.20
Granted 146,481 135,255 153,986  
Granted, Weighted Average Grant Date Fair Value $ 42.63 $ 53.65 $ 48.83  
Vested (148,000) (94,000) (88,000)  
Vested, Weighted Average Grant Date Fair Value $ 52.93 $ 51.86 $ 52.45  
Forfeited (43,000) (4,000) (16,000)  
Forfeitured, Weighted Average Grant Date Fair Value $ 51.47 $ 52.42 $ 57.37  
Outstanding, Ending Balance 303,000 348,000 311,000  
Restricted Stock or Unit Expense 7,000,000 7,000,000 5,000,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 9,000,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2.6      
Performance Share Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 1,000,000 6,000,000 3,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 278,000 115,000 125,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Outstanding, Beginning Balance 285,000 266,000 279,000  
Weighted Average Grant Date Fair Value $ 38.33 $ 47.48 $ 47.95 $ 44.64
Granted 278,000 115,000 125,000  
Granted, Weighted Average Grant Date Fair Value $ 25.98 $ 59.45 $ 46.71  
Vested (54,000) (90,000) (121,000)  
Vested, Weighted Average Grant Date Fair Value $ 25.42 $ 63.82 $ 39.72  
Forfeited (63,000) (6,000) (17,000)  
Forfeitured, Weighted Average Grant Date Fair Value $ 36.53 $ 53.35 $ 42.77  
Outstanding, Ending Balance 446,000 285,000 266,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 7,000,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1.5      
Performance Share Awards 2010 to 2012 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Grant Date 11/20/2009      
Share Based Compensation Weight Based On Earnings Per Share Used In Calculation Of Performance Targets     50.00%  
Share Based Compensation Weight Based on Divisional Average Return On Capital Used In Calculation Of Performance Targets     50.00%  
Performance Share Awards Performance Period     3 years  
Performance Share Awards 2011 to 2013 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Grant Date 12/3/2010      
Share Based Compensation Weight Based On Earnings Per Share Used In Calculation Of Performance Targets   50.00%    
Share Based Compensation Weight Based on Divisional Average Return On Capital Used In Calculation Of Performance Targets   50.00%    
Performance Share Awards Performance Period   3 years    
Performance Share Awards 2013 to 2014 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Grant Date 7/24/2012      
Performance Share Awards Performance Period 2 years      
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%      
Deferred Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 18,202 17,459 30,834  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Granted 18,202 17,459 30,834  
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Exercise Price Premium 20.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 3,000,000      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2      
Share Based Compensation Arrangement By Share Based Payment Award Contractual Term 5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.48%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 2.59%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 3.75      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 58.15%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Option, Fair Value $ 9.29      
Common Class A [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 12,200,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 5,900,000      
Common Class A [Member] | Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Common Stock Fair Value Per Share $ 28.43 [2] $ 57.63 [2] $ 46.48 [2]  
Common Class A [Member] | Performance Share Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Common Stock Fair Value Per Share $ 43.90 [3] $ 52.13 [3] $ 43.24 [3]  
Minimum [Member] | Performance Share Awards 2010 to 2012 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Award Payouts Threshold     50.00%  
Minimum [Member] | Performance Share Awards 2011 to 2013 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Award Payouts Threshold   50.00%    
Minimum [Member] | Performance Share Awards 2013 to 2014 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Award Payouts Threshold 50.00%      
Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 1,000,000      
Maximum [Member] | Performance Share Awards 2010 to 2012 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Award Payouts Threshold     200.00%  
Maximum [Member] | Performance Share Awards 2011 to 2013 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Award Payouts Threshold   200.00%    
Maximum [Member] | Performance Share Awards 2013 to 2014 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Performance Based Awards Award Payouts Threshold 200.00%      
[1] Amounts represent the difference between the exercise price and the closing price of the Company’s stock on the last trading day of the corresponding fiscal year, multiplied by the number of in-the-money options.
[2] Amounts represent the value of the Company’s Class A common stock on the date that the restricted stock units vested.
[3] Amounts represent the weighted average value of the Company’s Class A common stock on the date that the performance share awards vested.