Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 28,507	$ 31,336	$ 86,234	$ 99,497
Available-for-sale marketable securities
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $39 and $143, respectively for the thirteen weeks ended and $268 and $575, respectively for the thirty-nine weeks ended)	(103)	362	(683)	1,479
Other comprehensive income gain (loss), net of tax	(103)	362	(683)	1,479
Comprehensive income, net of tax	$ 28,404	$ 31,698	$ 85,551	$ 100,976