Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011
Income Statement [Abstract]
Sales	$ 118,022	$ 108,168
Cost of sales	104,764	96,360
Gross margin	13,258	11,808
Operating expenses	7,773	6,109
Research and development expenses	1,465	1,340
Income from operations	4,020	4,359
Interest expense	(1,081)	(2,397)
Other non-operating income (expense), net	(163)	20
Income from operations before income taxes	2,776	1,982
Income tax expense	1,069	1,390
Net income	$ 1,707	$ 592
Weighted average common shares and equivalents outstanding:
Basic	12,307	12,276
Diluted	12,372	12,330
Earnings per common share:
Basic earnings per share	$ 0.14	$ 0.05
Diluted earnings per share	$ 0.14	$ 0.05