Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 33,472	$ 41,472	$ 57,727	$ 68,161
Available-for-sale marketable securities
Unrealized holding gains (losses) arising during period (Net of deferred taxes of $77 and $396, respectively for the thirteen weeks ended and $229 and $433, respectively for the twenty-six weeks ended)	195	1,023	(580)	1,118
Reclassification adjustment for (gains) losses included in net income (Net of deferred taxes of $0 and $2, respectively for the thirteen weeks ended and $0 and $0, respectively for the twenty-six weeks ended)		6
Other comprehensive income gain (loss), net of tax	195	1,029	(580)	1,118
Comprehensive income, net of tax	$ 33,667	$ 42,501	$ 57,147	$ 69,279