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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 | 12 Months Ended
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Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Earnings Per Common Share [Abstract] |  |  |
Net income | $ 70,229 | $ 60,710 | $ 55,908
Less: Net income allocated to participating securities | (277) | (294) | (333)
Net income available to common shareholders | $ 69,952 | $ 60,416 | $ 55,575

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