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Earnings per Common Share - Schedule of Reconciliation of Net Income to Net Income Available to Common Shareholders (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 10,461	$ 10,584	$ 21,405	$ 17,376
Less: Net income allocated to participating securities	(52)	(46)	(99)	(73)
Net income available to common shareholders	$ 10,409	$ 10,538	$ 21,306	$ 17,303

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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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