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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 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Earnings Per Common Share [Abstract]        
Net income $ 10,965 $ 10,406 $ 33,084 $ 32,205
Less: Net income allocated to participating securities (68) (59) (198) (173)
Net income available to common shareholders $ 10,897 $ 10,347 $ 32,886 $ 32,032