Note 5 - Goodwill and Other Intangible Assets - Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 28, 2020	Nov. 30, 2019
Original cost	$ 1,122,394	$ 1,113,925
Accumulated amortization	(366,945)	(315,006)
Net identifiable intangibles	$ 755,449	$ 798,919
Weighted-average useful lives (in years) (Year)	17 years	17 years
Purchased Technology And Patents [Member]
Original cost	$ 113,775	$ 109,967
Accumulated amortization	(53,216)	(43,351)
Net identifiable intangibles	$ 60,559	$ 66,616
Weighted-average useful lives (in years) (Year)	13 years	13 years
Customer Relationships [Member]
Original cost	$ 933,943	$ 913,968
Accumulated amortization	(279,586)	(223,563)
Net identifiable intangibles	$ 654,357	$ 690,405
Weighted-average useful lives (in years) (Year)	17 years	17 years
Trade Names [Member]
Original cost	$ 63,266	$ 62,537
Accumulated amortization	(29,368)	(24,819)
Net identifiable intangibles	$ 33,898	$ 37,718
Weighted-average useful lives (in years) (Year)	14 years	14 years
Other Intangible Assets [Member]
Original cost	$ 11,410	$ 27,453
Accumulated amortization	(4,775)	(23,273)
Net identifiable intangibles	$ 6,635	$ 4,180
Weighted-average useful lives (in years) (Year)	12 years	10 years