Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 25, 2018	Feb. 26, 2017
Net periodic benefit cost:
Net periodic benefit cost	$ 1,775	$ 4,040
Pension Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	849	2,892
Postretirement Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	$ 926	$ 1,148