Note 10 - Pension and Postretirement Benefits - Asset Allocation (Details)		Nov. 28, 2020	Nov. 30, 2019
Equity Funds [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation		60.00%
Fixed Income Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocation		40.00%
Fixed Income Funds [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation		40.00%
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation		100.00%
Percentage of Plan Assets at Year End		100.00%	100.00%
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation		100.00%
Percentage of Plan Assets at Year End		100.00%	100.00%
Pension Plan [Member] | Equity Funds [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation		60.00%
Percentage of Plan Assets at Year End		55.40%	57.70%
Pension Plan [Member] | Equity Funds [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation		49.60%
Percentage of Plan Assets at Year End		48.80%	49.60%
Pension Plan [Member] | Fixed Income Funds [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation		40.00%
Percentage of Plan Assets at Year End		36.20%	63.80%
Pension Plan [Member] | Fixed Income Funds [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation		50.40%
Percentage of Plan Assets at Year End		51.00%	50.10%
Pension Plan [Member] | Insurance [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation		0.00%
Percentage of Plan Assets at Year End		0.00%	0.00%
Pension Plan [Member] | Insurance [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation		0.00%
Percentage of Plan Assets at Year End		0.00%	0.00%
Pension Plan [Member] | Cash [Member] | UNITED STATES
Defined Benefit Plan, Target Plan Asset Allocation	[1]	0.00%
Percentage of Plan Assets at Year End	[1]	8.40%	(21.50%)
Pension Plan [Member] | Cash [Member] | Foreign Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation	[1]	0.00%
Percentage of Plan Assets at Year End	[1]	0.20%	0.30%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Target Plan Asset Allocation		100.00%
Percentage of Plan Assets at Year End		100.00%	100.00%
Other Postretirement Benefits Plan [Member] | Equity Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocation		0.00%
Percentage of Plan Assets at Year End		0.00%	0.00%
Other Postretirement Benefits Plan [Member] | Fixed Income Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocation		0.00%
Percentage of Plan Assets at Year End		0.00%	0.00%
Other Postretirement Benefits Plan [Member] | Insurance [Member]
Defined Benefit Plan, Target Plan Asset Allocation		100.00%
Percentage of Plan Assets at Year End		99.40%	99.60%
Other Postretirement Benefits Plan [Member] | Cash [Member]
Defined Benefit Plan, Target Plan Asset Allocation	[1]	0.00%
Percentage of Plan Assets at Year End	[1]	0.60%	0.40%

[1] Negative cash for 2019 represents unsettled pending trades within an investment that are classified in cash and cash equivalents until settled.