Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2021	Feb. 23, 2020
Net periodic benefit (income) cost:
Net periodic benefit (income) cost	$ (284)	$ 2,213
Pension benefits
Net periodic benefit (income) cost:
Net periodic benefit (income) cost	(616)	1,704
Postretirement benefits
Net periodic benefit (income) cost:
Net periodic benefit (income) cost	$ 332	$ 509