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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, unless otherwise specified
 3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Earnings Per Common Share [Abstract]        
Net income $ 10,406 $ 10,267 $ 32,205 $ 31,672
Less: Net income allocated to participating securities (59) (54) (173) (153)
Net income available to common shareholders $ 10,347 $ 10,213 $ 32,032 $ 31,519