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Earnings per Common Share - Summary of Weighted-Average Number of Common Shares Outstanding Included in Calculation of Basic and Diluted EPS (Detail) 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]
Weighted-average common shares outstanding, basic	15,585	15,953	15,639	16,014
Weighted-average dilutive securities	94	116	105	123
Weighted-average common shares outstanding, diluted	15,679	16,069	15,744	16,137

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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