Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 25,745	$ 31,854	$ 40,130	$ 71,691
Other comprehensive (loss) income – unrealized (loss) gain on available-for-sale marketable debt securities, net of income tax	0	(11)	14	41
Comprehensive income	$ 25,745	$ 31,843	$ 40,144	$ 71,732