Note 6 - Goodwill and Other Intangible Assets - Amounts for Goodwill and Changes in Carrying Value by Operating Segment (Details) - USD ($) $ in Thousands			12 Months Ended
		Mar. 25, 2016	Dec. 31, 2016		Jan. 02, 2016		Dec. 27, 2014
Goodwill			$ 403,544		$ 189,767		$ 196,256
Goodwill, Acquired During Period			224,140	[1]	1,470	[2]
Goodwill adjustments	[3]		(10,363)		(7,959)
Electronics [Member]
Goodwill			215,765		58,246		60,510
Goodwill, Acquired During Period		$ 103,800	162,172	[1]	(524)	[2]
Goodwill adjustments	[3]		(4,653)		(1,740)
Automotive [Member]
Goodwill			144,585		80,262		81,717
Goodwill, Acquired During Period		$ 61,300	70,762	[1]	1,994
Goodwill adjustments	[3]		(6,439)		(3,449)
Industrial [Member]
Goodwill			43,194		51,259		$ 54,029
Goodwill, Acquired During Period			(8,794)	[1]		[2]
Goodwill adjustments	[3]		$ 729		$ (2,770)

[1] Included The net additions of $224,140 resulted primarily from the acquisitions of PolySwitch, ON and Menber's, partially offset by the impairment of custom products reporting unit goodwill.

[2] Electronics reduction resulted from reclassification of goodwill to customer relationships. Automotive addition of $2.0 million resulted from business acquisitions.

[3] Adjustments reflect the impact of changes in foreign exchange rates.