CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 31, 2016	Dec. 26, 2015
Income Statement [Abstract]
Net sales	$ 118,517	$ 116,403	$ 235,652	$ 242,612
Cost of sales	108,905	107,293	216,331	224,583
Gross profit	9,612	9,110	19,321	18,029
Operating expenses
Research, development and engineering expenses	1,603	1,506	3,187	3,062
Selling, general and administrative expenses	5,462	5,201	10,797	10,784
Total operating expenses	7,065	6,707	13,984	13,846
Operating income	2,547	2,403	5,337	4,183
Interest expense, net	552	521	1,141	1,054
Income before income taxes	1,995	1,882	4,196	3,129
Income tax provision	467	95	876	525
Net income	$ 1,528	$ 1,787	$ 3,320	$ 2,604
Earnings per share:
Net income per share — Basic	$ 0.14	$ 0.17	$ 0.31	$ 0.24
Weighted average shares outstanding — Basic	10,758	10,710	10,753	10,708
Net income per share — Diluted	$ 0.14	$ 0.16	$ 0.30	$ 0.23
Weighted average shares outstanding — Diluted	10,968	11,418	10,919	11,279