Provision For Restructuring (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ (10,012)	$ (6,654)	$ (10,866)
SG&A Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(1)
Costs incurred	17,900
Global Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(51)
Costs incurred	60,300
Profit Enhancement Plan
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(10,100)
Costs incurred	$ 15,300
Minimum | SG&A Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, termination benefits, expected payment period	1 month
Minimum | Global Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, termination benefits, expected payment period	1 month
Minimum | Profit Enhancement Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, termination benefits, expected payment period	1 month
Maximum | SG&A Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, termination benefits, expected payment period	24 months
Maximum | Global Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, termination benefits, expected payment period	24 months
Maximum | Profit Enhancement Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, termination benefits, expected payment period	24 months