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Share Based Compensation (Summary Of Performance Stock Units Activity) (Details) (Performance Shares [Member], USD $)
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Performance Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock units outstanding 52,799 79,024
Granted, number of stock units 13,434 13,072
Vested, number of stock units (23,454) (36,634)
Forfeited, number of stock units (2,027) (2,663)
Stock units outstanding 40,752 52,799
Stock units, weighted-average grant-date fair value $ 60.41 $ 45.32
Granted, weighted-average grant-date fair value $ 74.84 $ 74.31
Vested, weighted-average grant-date fair value $ 55.45 $ 32.81
Forfeited, weighted-average grant-date fair value $ 64.57 $ 60.65
Stock units, weighted-average grant-date fair value $ 67.81 $ 60.41