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Earnings per Common Share (Details 1)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Summary of weighted-average calculation of basic and diluted EPS
Weighted-average common shares outstanding, basic	15,914,000	16,803,000	16,606,000
Weighted-average diluted securities	132,000	179,000	119,000
Weighted-average common shares outstanding, diluted	16,046,000	16,982,000	16,725,000
Earnings per Common Share (Textual) [Abstract]
Weighted-average number of shares excluded from the computation of earnings per share	0	0	600,814

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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