Employee Benefit Plans - Benefit obligations in excess of fair value of plan assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 29, 2020	Nov. 24, 2019	Nov. 25, 2018
Pension plans, defined benefit [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	$ 1,261,763	$ 1,136,720
Service cost	4,026	3,377	$ 3,602
Interest cost	30,643	41,341	36,070
Plan participants' contribution	689	665
Actuarial loss (gain)	87,443	146,562
Net curtailment loss	(1,009)	64
Impact of foreign currency changes	10,899	(2,210)
Plan settlements	(64,525)	(436)
Net benefits paid	(65,300)	(64,320)
Benefit obligation at end of year	1,264,629	1,261,763	1,136,720
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	1,091,162	958,576
Actual return on plan assets	161,856	182,309
Employer contribution	20,865	15,062
Plan participants' contributions	689	665
Plan settlements	(64,525)	(436)
Impact of foreign currency changes	8,544	(694)
Net benefits paid	(65,300)	(64,320)
Fair value of plan assets at end of year	1,153,291	1,091,162	958,576
Unfunded status at end of year	(111,338)	(170,601)
Other postretirement benefit plans, defined benefit [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	72,135	82,907
Service cost	48	65	113
Interest cost	1,665	3,042	2,718
Plan participants' contribution	4,282	4,256
Actuarial loss (gain)	1,531	(2,903)
Net curtailment loss	0	0
Impact of foreign currency changes	0	0
Plan settlements	0	0
Net benefits paid	(12,300)	(15,232)
Benefit obligation at end of year	67,361	72,135	82,907
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contribution	8,018	10,976
Plan participants' contributions	4,282	4,256
Plan settlements	0	0
Impact of foreign currency changes	0	0
Net benefits paid	(12,300)	(15,232)
Fair value of plan assets at end of year	0	0	$ 0
Unfunded status at end of year	$ (67,361)	$ (72,135)