Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 30, 2016	Dec. 25, 2015	Dec. 26, 2014
Income Statement [Abstract]
Sales	$ 562,759	$ 469,103	$ 513,957
Cost of goods sold	475,976	398,073	440,824
Gross profit	86,783	71,030	73,133
Operating expenses:
Research and development	9,900	9,578	7,067
Sales and marketing	11,568	11,499	10,432
General and administrative	42,924	44,112	37,450
Total operating expenses	64,392	65,189	54,949
Income from operations	22,391	5,841	18,184
Interest and other income (expense), net	(3,444)	(2,234)	(1,854)
Income before provision for income taxes	18,947	3,607	16,330
Income tax provision	8,896	14,339	4,973
Net income (loss)	$ 10,051	$ (10,732)	$ 11,357
Net income (loss) per share:
Basic	$ 0.31	$ (0.34)	$ 0.39
Diluted	$ 0.30	$ (0.34)	$ 0.38
Shares used in computing net income (loss) per share:
Basic	32,632	31,564	29,301
Diluted	33,150	31,564	29,936