Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 29, 2021	Aug. 23, 2020	Aug. 29, 2021	Aug. 23, 2020
Net periodic benefit (income) cost:
Net periodic benefit (income) cost	$ (121)	$ 2,339	$ (695)	$ 6,714
Pension benefits
Net periodic benefit (income) cost:
Net periodic benefit (income) cost	(453)	1,830	(1,690)	5,186
Postretirement benefits
Net periodic benefit (income) cost:
Net periodic benefit (income) cost	$ 332	$ 509	$ 995	$ 1,528