Note 10 - Pension and Postretirement Benefits - Change in Benefit Obligation and Plan Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Pension Plan [Member] | UNITED STATES
Benefit obligation at beginning of year		$ 380,388	$ 336,889
Service cost		0	4	$ 56
Interest cost		11,738	14,691	12,251
Participant contributions		0	0
Actuarial (gain)/loss	[1]	27,377	49,211
Other		0	0
Curtailments		0	0
Settlement payments		(10,939)	0
Benefits paid		(20,034)	(20,407)
Foreign currency translation effect		0	0
Benefit obligation at end of year		388,530	380,388	336,889
Level 3 balance at beginning of year		383,527	346,460
Actual return on plan assets		44,365	54,527
Employer contributions		1,677	3,124
Participant contributions		0	0
Other		0	0
Settlement payments		(10,939)	0
Benefits paid	[2]	(20,227)	(20,584)
Foreign currency translation effect		0	0
Level 3 balance at end of year		398,403	383,527	346,460
Plan assets in excess of (less than) benefit obligation as of year end		9,873	3,139
Pension Plan [Member] | Foreign Plan [Member]
Benefit obligation at beginning of year		234,542	208,075
Service cost		2,950	2,237	2,311
Interest cost		3,158	4,678	4,671
Participant contributions		0	0
Actuarial (gain)/loss	[1]	4,350	30,517
Other		0	(103)
Curtailments		14	0
Settlement payments		(273)	(307)
Benefits paid		(8,628)	(8,356)
Foreign currency translation effect		14,448	(2,199)
Benefit obligation at end of year		250,561	234,542	208,075
Level 3 balance at beginning of year		185,331	169,455
Actual return on plan assets		13,155	22,945
Employer contributions		2,177	2,437
Participant contributions		0	0
Other		0	(103)
Settlement payments		0	0
Benefits paid	[2]	(8,628)	(8,356)
Foreign currency translation effect		10,207	(1,047)
Level 3 balance at end of year		202,242	185,331	169,455
Plan assets in excess of (less than) benefit obligation as of year end		(48,688)	(49,211)
Other Postretirement Benefits Plan [Member]
Benefit obligation at beginning of year		39,256	36,842
Service cost		73	98	173
Interest cost		1,135	1,550	1,484
Participant contributions		226	240
Actuarial (gain)/loss	[1]	1,327	3,749
Other		0	0
Curtailments		0	0
Settlement payments		0	0
Benefits paid		(2,942)	(3,223)
Foreign currency translation effect		0	0
Benefit obligation at end of year		39,075	39,256	36,842
Level 3 balance at beginning of year		94,474	82,910
Actual return on plan assets		15,673	12,046
Employer contributions		1,625	2,501
Participant contributions		226	240
Other		0	0
Settlement payments		0	0
Benefits paid	[2]	(2,942)	(3,223)
Foreign currency translation effect		0	0
Level 3 balance at end of year		109,056	94,474	$ 82,910
Plan assets in excess of (less than) benefit obligation as of year end		$ 69,981	$ 55,218

[1] Actuarial loss in 2020 and actuarial loss in 2019 for the U.S. Plans is primarily due to assumption changes. Actuarial loss in 2020 and actuarial loss in 2019 for the Non-U.S. Plans are due to both assumption changes and plan experience.

[2] Amount excludes benefit payments made from sources other than plan assets.