Note 10 - Pension and Postretirement Benefits - Changes in the Level 3 Plan Assets of Pension and Other Postretirement Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 28, 2020	Nov. 30, 2019
Pension Plan [Member] | UNITED STATES
Level 3 balance at beginning of year	$ 383,527	$ 346,460
Currency change effect	0	0
Level 3 balance at end of year	398,403	383,527
Pension Plan [Member] | Foreign Plan [Member]
Level 3 balance at beginning of year	185,331	169,455
Currency change effect	10,207	(1,047)
Level 3 balance at end of year	202,242	185,331
Other Postretirement Benefits Plan [Member]
Level 3 balance at beginning of year	94,474	82,910
Currency change effect	0	0
Level 3 balance at end of year	109,056	94,474
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | UNITED STATES
Level 3 balance at beginning of year	219
Level 3 balance at end of year	205	219
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Foreign Plan [Member]
Level 3 balance at beginning of year	675
Level 3 balance at end of year	770	675
Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]
Level 3 balance at beginning of year	94,082
Level 3 balance at end of year	108,406	94,082
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | UNITED STATES
Level 3 balance at beginning of year	219	266
Purchases, sales, issuances and settlements, net	(14)	(47)
Level 3 balance at end of year	205	219
Fixed Income Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Foreign Plan [Member]
Level 3 balance at beginning of year	675
Level 3 balance at end of year	770	675
Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Foreign Plan [Member]
Level 3 balance at beginning of year	675	662
Net transfers into / (out of) level 3	43	28
Net gains	(8)	5
Currency change effect	60	(20)
Level 3 balance at end of year	770	675
Insurance [Member] | Fair Value, Inputs, Level 3 [Member] | Other Postretirement Benefits Plan [Member]
Level 3 balance at beginning of year	94,082	82,446
Purchases, sales, issuances and settlements, net	(822)	(720)
Net transfers into / (out of) level 3	(831)	(403)
Net gains	15,977	12,759
Level 3 balance at end of year	$ 108,406	$ 94,082