Note 6 - Goodwill and Other Intangible Assets - Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 03, 2016	Nov. 28, 2015
Original cost	$ 372,949	$ 354,350
Accumulated amortization	(168,057)	(141,819)
Net identifiable intangibles	$ 204,892	$ 212,531
Weighted-average useful lives (Year)	15 years	15 years
Original cost	$ 372,949	$ 354,350
Accumulated amortization	(168,057)	(141,819)
Purchased Technology And Patents [Member]
Original cost	70,504	69,792
Accumulated amortization	(21,448)	(17,613)
Net identifiable intangibles	$ 49,056	$ 52,179
Weighted-average useful lives (Year)	10 years	10 years
Original cost	$ 70,504	$ 69,792
Accumulated amortization	(21,448)	(17,613)
Customer Relationships [Member]
Original cost	251,329	234,995
Accumulated amortization	(116,411)	(99,405)
Net identifiable intangibles	$ 134,918	$ 135,590
Weighted-average useful lives (Year)	17 years	17 years
Original cost	$ 251,329	$ 234,995
Accumulated amortization	(116,411)	(99,405)
Other Intangible Assets [Member]
Original cost	51,116	49,563
Accumulated amortization	(30,198)	(24,801)
Net identifiable intangibles	$ 20,918	$ 24,762
Weighted-average useful lives (Year)	12 years	13 years
Original cost	$ 51,116	$ 49,563
Accumulated amortization	$ (30,198)	$ (24,801)