Provision For Restructuring (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2016	Mar. 29, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 432	$ 1,304
Profit Enhancement Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expense	400
Restructuring related cost incurred to date	$ 16,000
Profit Enhancement Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Termination benefits, expected payment period	1 month
Profit Enhancement Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Termination benefits, expected payment period	24 months
Global Restructuring Plan (including LEAN)
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 30
Restructuring related cost incurred to date	$ 60,000
Global Restructuring Plan (including LEAN) | Minimum
Restructuring Cost and Reserve [Line Items]
Termination benefits, expected payment period	1 month
Global Restructuring Plan (including LEAN) | Maximum
Restructuring Cost and Reserve [Line Items]
Termination benefits, expected payment period	24 months