Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Dec. 25, 2015
Income Statement [Abstract]
Sales	$ 924,351	$ 562,759	$ 469,103
Cost of goods sold	756,722	475,976	398,073
Gross profit	167,629	86,783	71,030
Operating expenses:
Research and development	11,666	9,900	9,578
Sales and marketing	13,748	11,568	11,499
General and administrative	52,818	42,924	44,112
Total operating expenses	78,232	64,392	65,189
Income from operations	89,397	22,391	5,841
Interest and other income (expense), net	(2,455)	(3,444)	(2,234)
Income before provision for income taxes	86,942	18,947	3,607
Income tax provision	11,857	8,896	14,339
Net income (loss)	$ 75,085	$ 10,051	$ (10,732)
Net income (loss) per share:
Basic	$ 2.25	$ 0.31	$ (0.34)
Diluted	$ 2.19	$ 0.30	$ (0.34)
Shares used in computing net income (loss) per share:
Basic	33,409	32,632	31,564
Diluted	34,303	33,150	31,564