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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 | 6 Months Ended
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Feb. 28, 2014 | Feb. 28, 2013 | Feb. 28, 2014 | Feb. 28, 2013
Earnings Per Common Share [Abstract] |  |  |  |
Net income | $ 10,317 | $ 10,461 | $ 21,799 | $ 21,405
Less: Net income allocated to participating securities | (56) | (52) | (114) | (99)
Net income available to common shareholders | $ 10,261 | $ 10,409 | $ 21,685 | $ 21,306

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