Property and Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 2,090,871	$ 2,029,773
Less accumulated depreciation and amortization	1,204,628	1,151,578
Property and equipment, net	886,243	878,195
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	129,878	134,813
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	693,898	655,487
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	1,054,986	1,033,967
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 212,109	$ 205,506
Minimum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Minimum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Minimum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Maximum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	60 years
Maximum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	12 years
Maximum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	20 years