Provision For Restructuring (Schedule Of Restructuring Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 10,012	$ 6,654	$ 10,866
Profit Enhancement Plan
Restructuring Cost and Reserve [Line Items]
Severance and other employee-related charges	(9,387)	(5,181)	0
Other exit costs	677	101	0
Restructuring expense	10,100
Global Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Severance and other employee-related charges	122	(976)	(7,421)
Asset impairments	0	172	1,210
Other exit costs	71	231	2,389
Restructuring expense	51
SG&A Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Severance and other employee-related charges	(1)	(7)	(222)
Other exit costs	0	$ 0	$ 68
Restructuring expense	$ 1