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Share-based Payments - Stock Options (Details) - Stock Incentive Plan - Stock options - $ / shares
shares in Millions
12 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Beginning of period, Outstanding (in shares) 1.1 1.2 0.9  
Granted (in shares)     0.3  
Exercised (less than) (in shares) (0.1) (0.1) (0.1)  
Cancelled (in shares) (0.1)      
End of period, Outstanding (in shares) 1.0 1.1 1.2  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Beginning of period, Outstanding (in dollars per share) $ 132.50 $ 127.98 $ 133.19  
Granted (in dollars per share)     108.96  
Exercised (in dollars per share) 126.92 88.94 108.58  
Cancelled (in dollars per share) 227.15      
End of period, Outstanding (in dollars per share) $ 131.81 $ 132.50 $ 127.98  
Outstanding, Number of Shares (in shares) 0.9 0.6 0.5 0.4
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 135.91 $ 143.15 $ 142.36 $ 151.07
$100.00 - $160.00 (average life - 6.2 years)        
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract]        
Range of option exercise prices, lower range limit (in dollars per share) 100.00      
Range of option exercise prices, upper range limit (in dollars per share) $ 160.00      
Range of option exercise prices, average life 6 years 2 months 12 days      
Range of option exercise prices, Outstanding, Number of Shares (in shares) 0.8      
Range of option exercise prices, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 119.24      
Range of option exercise prices, Exercisable, Number of Shares (in shares) 0.7      
Range of option exercise prices, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 121.22      
$160.01 - $210.00 (average life - 2.2 years)        
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract]        
Range of option exercise prices, lower range limit (in dollars per share) 160.01      
Range of option exercise prices, upper range limit (in dollars per share) $ 210.00      
Range of option exercise prices, average life 2 years 2 months 12 days      
Range of option exercise prices, Outstanding, Number of Shares (in shares) 0.1      
Range of option exercise prices, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 207.80      
Range of option exercise prices, Exercisable, Number of Shares (in shares) 0.1      
Range of option exercise prices, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 207.80      
$210.01 - $239.76 (average life - 3.1 years)        
Share-based Payment Arrangement, Option, Exercise Price Range, End of Period [Abstract]        
Range of option exercise prices, lower range limit (in dollars per share) 210.01      
Range of option exercise prices, upper range limit (in dollars per share) $ 239.76      
Range of option exercise prices, average life 3 years 1 month 6 days      
Range of option exercise prices, Outstanding, Number of Shares (in shares) 0.1      
Range of option exercise prices, Outstanding, Weighted Average Exercise Price (in dollars per share) $ 239.76      
Range of option exercise prices, Exercisable, Number of Shares (in shares) 0.1      
Range of option exercise prices, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 239.76