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Share-Based Compensation (Summary Of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Stock options outstanding, number of stock options 122,519 127,286  
Granted, number of stock options 46,306 47,223  
Exercised, number of stock options (37,651) (43,556)  
Forfeited/ cancelled, number of stock options (54,371) (8,434)  
Stock options outstanding, number of stock options 76,803 122,519 127,286
Exercisable number of stock options 25,469 36,348 57,250
Stock options outstanding, average exercise price $ 74.43 $ 71.24  
Granted, average exercise price 91.52 78.23  
Exercised, average exercise price 74.02 69.33  
Forfeited/ cancelled, average exercise price 78.49 73.90  
Stock options outstanding, average exercise price 82.06 74.43 $ 71.24
Exercisable average exercise price $ 72.70 $ 71.37 $ 68.57
Aggregate intrinsic value outstanding $ 1,487 $ 521  
Exercised aggregate intrinsic value 538 681  
Aggregate intrinsic value outstanding 1,053 1,487 $ 521
Exercisable aggregate intrinsic value $ 587 $ 553 $ 362
Average remaining contractual term (years) 7 years 8 months 12 days 7 years 6 months 7 years 4 months 24 days
Exercisable average remaining contractual term (years) 5 years 6 months 5 years 9 months 18 days 6 years 1 month 6 days