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Share Based Compensation (Summary Of Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock units outstanding 67,535 71,826
Granted, number of stock units 30,551 40,212
Vested, number of stock units (37,534) (37,381)
Forfeited, number of stock units (3,121) (7,122)
Stock units outstanding 57,431 67,535
Stock units, weighted-average grant-date fair value $ 54.35 $ 47.99
Granted, weighted-average grant-date fair value $ 77.46 $ 58.27
Vested, weighted-average grant-date fair value $ 51.82 $ 47.87
Forfeited, weighted-average grant-date fair value $ 65.52 $ 51.16
Stock units, weighted-average grant-date fair value $ 68.06 $ 54.35