Income Taxes (Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits at beginning of year	$ 25,899	$ 26,592	$ 24,436
Increases in tax positions for prior years	1,808	585	910
Decreases in tax positions for prior years	(5,476)	0	(1,083)
Increases in tax positions for current year	2,854	1,164	4,003
Settlements	(1,281)	0	0
Lapse in statute of limitations	(2,609)	(2,442)	(1,674)
Gross unrecognized tax benefits at end of year	$ 21,195	$ 25,899	$ 26,592