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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	3 Months Ended						9 Months Ended
	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	May 31, 2019	May 31, 2018
Earnings Per Common Share [Abstract]
Net income	$ 18,139	$ 15,906	$ 13,279	$ 16,130	$ 14,818	$ 12,630	$ 47,324	$ 43,578
Less: Net income allocated to participating securities	(105)			(105)			(286)	(283)
Net income available to common shareholders	$ 18,034			$ 16,025			$ 47,038	$ 43,295

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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