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Share Based Compensation (Summary Of Performance Stock Units Activity) (Details) - Performance Shares [Member] - $ / shares
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock units outstanding 40,752 52,799
Granted, number of stock units 12,328 13,434
Vested, number of stock units (15,786) (23,454)
Forfeited, number of stock units (3,438) (2,027)
Stock units outstanding 33,856 40,752
Stock units, weighted-average grant-date fair value $ 67.81 $ 60.41
Granted, weighted-average grant-date fair value 80.33 74.84
Vested, weighted-average grant-date fair value 57.09 55.45
Forfeited, weighted-average grant-date fair value 76.44 64.57
Stock units, weighted-average grant-date fair value $ 76.50 $ 67.81