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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		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Earnings Per Common Share [Abstract]
Net income	$ 14,818	$ 12,360	$ 27,448	$ 24,118
Less: Net income allocated to participating securities	(96)	(75)	(178)	(152)
Net income available to common shareholders	$ 14,722	$ 12,285	$ 27,270	$ 23,966

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256

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The portion of net income for the reporting period allocated to participating securities other than common shares for the purpose of computing earnings per common share using the two-class method. Net income allocated to participating securities for the period includes dividend equivalents paid to holders of participating securities plus a proportionate share of undistributed net income allocable to participating securities for the period.

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