Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 82,460	$ 72,254	$ 41,305
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net of tax of $0, $0, and $0, respectively	145	(1,015)	1,187
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 $(114), $(63), and $60, respectively	347	191	(90)
Comprehensive income	$ 83,553	$ 71,430	$ 42,402