Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 24, 2019	Feb. 25, 2018
Net periodic benefit cost:
Net periodic benefit cost	$ 4,870	$ 1,775
Pension Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	3,977	849
Postretirement Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	$ 893	$ 926