Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 24,255	$ 26,689
Available-for-sale marketable securities
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $306 and $38, respectively for the thirteen weeks ended)	(774)	95
Reclassification adjustment for (gains) losses included in net income (Net of deferred taxes of $0 and $2, respectively for the thirteen weeks ended)		(6)
Other comprehensive income gain (loss), net of tax	(774)	89
Comprehensive income, net of tax	$ 23,481	$ 26,778