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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
	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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