Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 25,535	$ 12,529	$ 27,345	$ 26,211
Other comprehensive loss, before tax:
Change in unrealized gains and losses on derivatives	(137)	(37)	(152)	(16)
Change in unrealized gains and losses on available-for-sale investments	0	0	0	16
Other comprehensive loss, before tax	(137)	(37)	(152)	0
Tax benefit related to derivatives	18	7	19	1
Tax provision related to available-for-sale investments	0	0	0	(4)
Other comprehensive loss, net of tax	(119)	(30)	(133)	(3)
Comprehensive income	$ 25,416	$ 12,499	$ 27,212	$ 26,208