Note 6 - Goodwill and Other Intangible Assets - Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 28, 2015	Nov. 29, 2014
Purchased Technology And Patents [Member]
Original cost	$ 69,792	$ 43,915
Accumulated amortization	(17,613)	(11,944)
Net identifiable intangibles	$ 52,179	$ 31,971
Weighted-average useful lives (in years)	10 years	11 years
Customer Relationships [Member]
Original cost	$ 234,995	$ 219,517
Accumulated amortization	(99,405)	(88,164)
Net identifiable intangibles	$ 135,590	$ 131,353
Weighted-average useful lives (in years)	17 years	18 years
Other Intangible Assets [Member]
Original cost	$ 49,563	$ 52,529
Accumulated amortization	(24,801)	(20,458)
Net identifiable intangibles	$ 24,762	$ 32,071
Weighted-average useful lives (in years)	13 years	12 years
Original cost	$ 354,350	$ 315,961
Accumulated amortization	(141,819)	(120,566)
Net identifiable intangibles	$ 212,531	$ 195,395
Weighted-average useful lives (in years)	15 years	16 years