Earnings (Loss) Per Share - Reconciliation of Income from Operations Applicable to Common Shares and Computation of Diluted Weighted Average Shares Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Numerator:
Net income (loss)	$ 2,058	$ (5,452)	$ 4,956	$ (5,200)
Less: Allocation to participating securities	(4)		(15)
Net income (loss) applicable to common shares	$ 2,054	$ (5,452)	$ 4,941	$ (5,200)
Denominator:
Weighted average common shares outstanding, basic	12,395	12,300	12,349	12,292
Dilutive stock options and awards	275		199
Weighted average common shares outstanding, diluted	12,670	12,300	12,548	12,292