Note 8 - Components of Net Periodic Benefit Related to Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 29, 2020	Aug. 31, 2019	Aug. 29, 2020	Aug. 31, 2019
Pension Plan [Member] | UNITED STATES
Service cost	$ 0	$ 1	$ 0	$ 3
Interest cost	2,935	3,673	8,803	7,346
Expected return on assets	(6,439)	(6,326)	(19,318)	(12,652)
Prior service cost (benefit)	(1)	3	(2)	10
Actuarial loss	1,799	1,169	5,397	3,507
Net periodic (benefit) cost	(1,706)	(1,480)	(5,120)	(1,786)
Pension Plan [Member] | Foreign Plan [Member]
Service cost	743	557	2,184	1,687
Interest cost	785	1,154	2,348	3,527
Expected return on assets	(2,812)	(2,517)	(8,408)	(7,710)
Prior service cost (benefit)	16	16	48	48
Actuarial loss	959	772	2,839	2,347
Net periodic (benefit) cost	(309)	(18)	(989)	(101)
Other Postretirement Benefits Plan [Member]
Service cost	18	24	55	73
Interest cost	284	387	851	1,162
Expected return on assets	(1,994)	(1,752)	(5,982)	(5,259)
Prior service cost (benefit)	0	0	0	0
Actuarial loss	15	8	46	25
Net periodic (benefit) cost	$ (1,677)	$ (1,333)	$ (5,030)	$ (3,999)