Note 10 - Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Pension Plan [Member] | UNITED STATES
Service cost	$ 0	$ 4	$ 56
Interest cost	11,738	14,691	12,251
Expected return on assets	(25,758)	(25,305)	(26,167)
Prior service cost (benefit)	(3)	13	29
Actuarial loss	7,195	4,677	5,904
Curtailment loss	0	0	0
Settlement charge	0	0	0
Net periodic (benefit) cost	(6,828)	(5,920)	(7,927)
Pension Plan [Member] | Foreign Plan [Member]
Service cost	2,950	2,237	2,311
Interest cost	3,158	4,678	4,671
Expected return on assets	(11,312)	(10,224)	(11,105)
Prior service cost (benefit)	64	64	(4)
Actuarial loss	3,829	3,114	2,901
Curtailment loss	14	83	0
Settlement charge	67	0	0
Net periodic (benefit) cost	(1,230)	(48)	(1,226)
Other Postretirement Benefits Plan [Member]
Service cost	73	98	173
Interest cost	1,135	1,550	1,484
Expected return on assets	(7,976)	(7,013)	(6,896)
Prior service cost (benefit)	0	0	0
Actuarial loss	62	33	60
Curtailment loss	0	0	0
Settlement charge	0	0	0
Net periodic (benefit) cost	$ (6,706)	$ (5,332)	$ (5,179)