Summary Of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Property, Plant and Equipment [Line Items]
Percent of cost for inventories	84.00%	85.00%
Inventories and current assets excess if reported as FIFO	$ 346,558,000	$ 279,413,000
Useful life of computer software, years	3
Amounts capitalized on computer software costs	9,818,000	7,514,000	11,959,000
Accumulated other comprehensive earnings, AFS securities	72,879,000	76,400,000
Accumulated other comprehensive earnings, AFS securities, tax effect	28,176,000	29,536,000
Accumulated other comprehensive earnings, unfunded postretirement benefit obligation	23,536,000	14,077,000
Accumulated other comprehensive earnings, unfunded postretirement benefit obligation, less tax effect	9,094,000	5,439,000
Cooperative advertising allowances recognized	8,898,000	10,715,000	7,982,000
Advertising costs	$ 202,405,000	$ 191,788,000	$ 180,159,000
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum years	10
Estimated useful life, maximum years	40
Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum years	3
Estimated useful life, maximum years	20
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life, minimum years	5
Estimated useful life, maximum years	40