Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 82,552	$ 82,460	$ 72,254
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net of tax of $0, $0, and $0, respectively	65	145	(1,015)
Reclassification adjustment for currency translation adjustments on planned disposal of a subsidiary, net of tax of $0, included in miscellaneous income, net on the consolidated statement of income		601
Unrealized gain/(loss) arising during the period on investments, net of tax of $79, $(114), and $(63), respectively	(237)	347	191
Comprehensive income	$ 82,380	$ 83,553	$ 71,430