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Earnings Per Common Share (Schedule Of Reconciliation Of Net Income To Net Income Available To Common Shareholders) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Earnings Per Common Share [Abstract]        
Net income $ 12,360 $ 13,669 $ 24,118 $ 25,731
Less: Net income allocated to participating securities (75) (87) (152) (162)
Net income available to common shareholders $ 12,285 $ 13,582 $ 23,966 $ 25,569