Retirement Plans (Schedule Of Costs Of Retirement Plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension Cost (Reversal of Cost)	$ 3,504	$ 6,781	$ 5,574
Retirement savings plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Cost (Reversal of Cost)	3,525	3,343	3,593
Deferred compensation plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Cost (Reversal of Cost)	508	813	788
Supplemental executive retirement plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Cost (Reversal of Cost)	$ (529)	$ 2,625	$ 1,193