Property and Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 2,188,705	$ 2,140,361
Less accumulated depreciation and amortization	1,301,777	1,252,753
Property and equipment, net	886,928	887,608
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	137,977	133,386
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	736,812	713,128
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	1,096,252	1,069,616
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 217,664	$ 224,231
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