Restructuring Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 66	$ 5,431
March 2015 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	300	3,600
Restructuring and related cost, cost incurred to date	20,900
Restructuring and related cost, expected cost	21,000
September 2015 Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(200)	$ 1,800
Restructuring and related cost, cost incurred to date	7,700
Restructuring and related cost, expected cost	$ 8,000