Employee Benefit Plans - Defined benefit plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 24, 2019	Nov. 25, 2018	Nov. 26, 2017
Pension plans, defined benefit [Member]
Net periodic benefit cost:
Service cost(1)	$ 3,377	$ 3,602	$ 3,427
Interest cost	41,341	36,070	36,853
Expected return on plan assets(1)	(42,098)	(48,830)	(42,033)
Amortization of prior service benefit	(61)	(65)	(62)
Amortization of actuarial loss	13,306	12,650	13,489
Curtailment loss	13	38	106
Net settlement (gain) loss	(56)	(102)	126
Net periodic benefit cost	15,822	3,363	11,906
Changes in accumulated other comprehensive loss:
Actuarial loss (gain)	6,309	15,373	(9,785)
Amortization of prior service benefit (cost)	61	65	62
Amortization of actuarial loss	(13,306)	(12,650)	(13,489)
Net settlement gain (loss)	56	102	(126)
Total recognized in accumulated other comprehensive loss	(6,880)	2,890	(23,338)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	8,942	6,253	(11,432)
Other postretirement benefit plans, defined benefit [Member]
Net periodic benefit cost:
Service cost(1)	65	113	172
Interest cost	3,042	2,718	3,148
Expected return on plan assets(1)	0	0	0
Amortization of prior service benefit	0	0	0
Amortization of actuarial loss	465	872	1,271
Curtailment loss	0	0	0
Net settlement (gain) loss	0	0	0
Net periodic benefit cost	3,572	3,703	4,591
Changes in accumulated other comprehensive loss:
Actuarial loss (gain)	(2,903)	(6,354)	(5,516)
Amortization of prior service benefit (cost)	0	0	0
Amortization of actuarial loss	(465)	(872)	(1,271)
Net settlement gain (loss)	0	0	0
Total recognized in accumulated other comprehensive loss	(3,368)	(7,226)	(6,787)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss	$ 204	$ (3,523)	$ (2,196)