Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 26, 2019	May 27, 2018	May 26, 2019	May 27, 2018
Net periodic benefit cost:
Net periodic benefit cost	$ 4,909	$ 1,692	$ 9,779	$ 3,467
Pension Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	4,016	766	7,993	1,615
Postretirement Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	$ 893	$ 926	$ 1,786	$ 1,852