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Earnings per Common Share (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Reconciliation of net income to net income available to common shareholders
Net income	$ 35,485	$ 36,433	$ 36,095
Less: Net income allocated to participating securities	(152)	(130)	(120)
Net income available to common shareholders	$ 35,333	$ 36,303	$ 35,975

X

- Definition

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

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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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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