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Stock-based Compensation (Schedule Of Market Share Units Activity) (Details) - Market Share Units [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, Number of Shares 36,594    
Granted, Number of Shares 13,195    
Performance factor adjustment, Number of Shares 8,890    
Converted to common shares, Number of Shares (20,050)    
Forfeited, Number of Shares (1,428)    
Outstanding, Number of Shares 37,201 [1] 36,594  
Outstanding, Weighted-Average Grant Date Fair Value Per Share $ 194.83    
Granted, Weighted-Average Grant Date Fair Value Per Share 232.99 $ 184.96 $ 216.77
Performance factor adjustment, Weighted-Average Grant Date Fair Value Per Share 186.38    
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share 182.13    
Forfeited, Weighted-Average Grant Date Fair Value Per Share 208.74    
Outstanding, Weighted-Average Grant Date Fair Value Per Share $ 212.66 [1] $ 194.83  
Outstanding, Aggregate Intrinsic Value [1] $ 7,037    
Percent of original target number of vested shares 100.00%    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of original target number of vested shares 200.00%    
[1] This figure represents the total number of shares underlying MSU grants assuming achievement of the target number of shares at 100%. As the ultimate number of shares that vest could be as high as 200% of the target, the Company may be required to issue additional shares to satisfy outstanding MSU award grants.