Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2020	Mar. 29, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 26,282	$ 22,712
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	(1,673)	117
Unrealized gains on available-for-sale investment securities arising during the period, net of tax	168	154
Comprehensive income	$ 24,777	$ 22,983