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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, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Earnings Per Common Share [Abstract]
Net income	$ 39,813	$ 35,485	$ 36,433
Less: Net income allocated to participating securities	(196)	(152)	(130)
Net income available to common shareholders	$ 39,617	$ 35,333	$ 36,303

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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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-Name Statement of Financial Accounting Standard (FAS)

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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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