Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 16,346	$ 20,994	$ 42,628	$ 43,706
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	71	(241)	(1,602)	(124)
Unrealized gains (losses) on available- for-sale investment securities arising during the period, net of tax	(211)	249	(43)	403
Comprehensive income	$ 16,206	$ 21,002	$ 40,983	$ 43,985