Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 28, 2017	May 29, 2016	May 28, 2017	May 29, 2016
Pension Benefits [Member]
Net periodic benefit cost:
Service cost	$ 2,479	$ 2,072	$ 4,942	$ 4,130
Interest cost	9,188	9,490	18,368	18,962
Expected return on plan assets	(12,122)	(12,162)	(24,237)	(24,296)
Amortization of prior service benefit	(15)	(16)	(30)	(31)
Amortization of actuarial loss	3,379	3,028	6,758	6,035
Curtailment (gain) loss, net	67	0	67	0
Net settlement loss	94	0	94	0
Net periodic benefit cost	3,070	2,412	5,962	4,800
Changes in accumulated other comprehensive loss:
Actuarial loss	6	18	(3)	170
Amortization of prior service benefit	15	16	30	31
Amortization of actuarial loss	(3,379)	(3,028)	(6,758)	(6,035)
Net settlement loss	(94)	0	(94)	0
Total recognized in accumulated other comprehensive loss	(3,452)	(2,994)	(6,825)	(5,834)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	(382)	(582)	(863)	(1,034)
Postretirement Benefits [Member]
Net periodic benefit cost:
Service cost	43	50	86	100
Interest cost	787	806	1,574	1,612
Expected return on plan assets	0	0	0	0
Amortization of prior service benefit	0	0	0	0
Amortization of actuarial loss	317	741	635	1,483
Curtailment (gain) loss, net	0	0	0	0
Net settlement loss	0	0	0	0
Net periodic benefit cost	1,147	1,597	2,295	3,195
Changes in accumulated other comprehensive loss:
Actuarial loss	0	0	0	0
Amortization of prior service benefit	0	0	0	0
Amortization of actuarial loss	(317)	(741)	(635)	(1,483)
Net settlement loss	0	0	0	0
Total recognized in accumulated other comprehensive loss	(317)	(741)	(635)	(1,483)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	$ 830	$ 856	$ 1,660	$ 1,712