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, 2021	Feb. 28, 2021	Nov. 30, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	May 31, 2021	May 31, 2020
Earnings Per Common Share [Abstract]
Net income	$ 21,006	$ 17,191	$ 23,623	$ 14,524	$ 14,327	$ 12,194	$ 61,820	$ 41,045
Less: Net income allocated to participating securities	(73)			(68)			(247)	(203)
Net income available to common shareholders	$ 20,933			$ 14,456			$ 61,573	$ 40,842