Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 24, 2020	May 26, 2019	May 24, 2020	May 26, 2019
Net periodic benefit cost:
Net periodic benefit cost	$ 2,162	$ 4,909	$ 4,375	$ 9,779
Total pension plan contributions	4,000		14,500
Pension benefits
Net periodic benefit cost:
Net periodic benefit cost	1,652	4,016	3,356	7,993
Postretirement benefits
Net periodic benefit cost:
Net periodic benefit cost	$ 510	$ 893	$ 1,019	$ 1,786