Note 4 - Supplemental Financial Statement Information - Balance Sheet Information (Details) - USD ($) $ in Thousands	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Raw materials	$ 151,026	$ 150,338
Finished goods	172,187	186,929
Total inventories	323,213	337,267
Other receivables	18,666	26,258
Prepaid income taxes	22,137	23,112
Prepaid taxes other than income taxes	20,270	16,836
Prepaid expenses	19,212	20,862
Assets held for sale	828	3,655
Total other current assets	81,113	90,723
Land	87,403	79,631
Buildings and improvements	393,175	362,114
Machinery and equipment	876,858	808,154
Construction in progress	70,747	54,332
Total, at cost	1,428,183	1,304,231
Accumulated depreciation	(757,439)	(674,418)
Net property, plant and equipment	670,744	629,813	$ 636,549
Investments and company owned life insurance	9,006	8,870
Equity method investments	53,863	53,696
Equity Securities without Readily Determinable Fair Value, Amount	1,669	1,667
Long-term deferred income taxes	37,376	29,037
Operating Lease, Right-of-Use Asset	28,445	0
Other long-term receivables	16,760	46,887
Other long-term assets	14,751	14,129
Total other assets	278,213	241,352
Taxes other than income taxes	16,893	15,031
Miscellaneous services	5,691	5,541
Customer rebates	15,008	11,293
Interest	4,901	4,572
Insurance	184	178
Product liability	501	978
Contingent consideration liability	0	3,400
Accrued expenses	32,092	19,752
Total other accrued expenses	83,976	60,745
Other liabilities:
Asset Retirement Obligations, Noncurrent, Total	2,948	2,952
Long-term deferred income taxes	165,877	177,530
Long-term income tax liability	18,089	10,088
Long-term deferred compensation	8,510	6,929
Postretirement other than pension	2,930	2,879
Long-term accrued payroll tax	7,216	0
Environmental liabilities	3,639	4,657
Other long-term liabilities	50,212	37,155
Total other liabilities	278,919	242,190
Other Accrued Expenses [Member]
Current operating lease liabilities	8,706	0
Other Noncurrent Liabilities [Member]
Other liabilities:
Noncurrent operating lease liabilities	19,498	0
Pension Plan [Member]
Prepaid postretirement costs	43,206	28,759
Other Postretirement Benefits Plan [Member]
Prepaid postretirement costs	$ 73,137	$ 58,307