Note 11 - Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2019	Dec. 01, 2018	Dec. 02, 2017
Pension Plan [Member] | UNITED STATES
Service cost	$ 4	$ 56	$ 111
Interest cost	14,691	12,251	15,836
Expected return on assets	(25,305)	(26,167)	(25,458)
Prior service cost (benefit)	13	29	29
Actuarial loss	4,677	5,904	5,905
Curtailment loss	0	0	0
Settlement charge	0	0	0
Net periodic (benefit) cost	(5,920)	(7,927)	(3,577)
Pension Plan [Member] | Foreign Plan [Member]
Service cost	2,237	2,311	2,125
Interest cost	4,678	4,671	4,709
Expected return on assets	(10,224)	(11,105)	(9,853)
Prior service cost (benefit)	64	(4)	(4)
Actuarial loss	3,114	2,901	3,492
Curtailment loss	83	0	0
Settlement charge	0	0	16
Net periodic (benefit) cost	(48)	(1,226)	485
Other Postretirement Benefits Plan [Member]
Service cost	98	173	208
Interest cost	1,550	1,484	1,593
Expected return on assets	(7,013)	(6,896)	(5,788)
Prior service cost (benefit)	0	0	0
Actuarial loss	33	60	1,010
Curtailment loss	0	0	0
Settlement charge	0	0	0
Net periodic (benefit) cost	$ (5,332)	$ (5,179)	$ (2,977)