Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 25, 2016
Income Statement [Abstract]
Sales	$ 204,594	$ 112,229
Cost of goods sold	167,099	97,659
Gross profit	37,495	14,570
Operating expenses:
Research and development	2,906	2,276
Sales and marketing	3,051	2,933
General and administrative	11,765	10,059
Total operating expenses	17,722	15,268
Income (loss) from operations	19,773	(698)
Interest and other income (expense), net	(938)	(1,091)
Income (loss) before provision for income taxes	18,835	(1,789)
Income tax provision	4,494	1,450
Net income (loss)	$ 14,341	$ (3,239)
Net income (loss) per share:
Basic	$ 0.43	$ (0.10)
Diluted	$ 0.42	$ (0.10)
Shares used in computing net income (loss) per share:
Basic	33,061	32,309
Diluted	33,865	32,309