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Earnings Per Common Share (Schedule Of Weighted Average Number Of Shares) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Earnings Per Common Share [Abstract]        
Weighted-average common shares outstanding, basic 13,700 13,712 13,687 13,713
Weighted-average dilutive securities 29 25 31 28
Weighted-average common shares outstanding, diluted 13,729 13,737 13,718 13,741