Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 27, 2018	May 28, 2017	May 27, 2018	May 28, 2017	Nov. 26, 2017
Net periodic benefit cost:
Net periodic benefit cost	$ 1,692	$ 4,217	$ 3,467	$ 8,257
Estimated future employer contributions in fiscal year 2018	124,000		124,000		$ 94,700
Pension Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	766	3,070	1,615	5,962
Postretirement Benefits [Member]
Net periodic benefit cost:
Net periodic benefit cost	$ 926	$ 1,147	$ 1,852	$ 2,295