CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 16, 2022	Jul. 17, 2021	Jul. 16, 2022	Jul. 17, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 5,115	$ 16,814	$ 24,404	$ 36,330
Other comprehensive income, before tax
Postretirement liability adjustment	7,258	57	7,288	133
Income tax expense related to items of other comprehensive income	(1,780)	(13)	(1,787)	(32)
Total other comprehensive income, after tax	5,478	44	5,501	101
Comprehensive income	$ 10,593	$ 16,858	$ 29,905	$ 36,431