Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 1,416	$ 11,038	$ 14,385	$ 39,837
Other comprehensive (loss) income – unrealized (loss) gain on available-for-sale marketable debt securities, net of income tax	0	(20)	14	52
Comprehensive income	$ 1,416	$ 11,018	$ 14,399	$ 39,889