Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Summary Of Significant Accounting Policies [Line Items]
Percent of cost for inventories	84.00%	84.00%
Inventories and current assets excess if reported as FIFO	$ 374,977,000	$ 346,558,000
Amounts capitalized on computer software costs	11,144,000	9,818,000	7,514,000
Accumulated other comprehensive earnings, AFS securities	95,016,000	72,879,000
Accumulated other comprehensive earnings, AFS securities, tax effect	36,730,000	28,176,000
Accumulated other comprehensive earnings, unfunded post retirement benefit obligation	32,589,000	23,536,000
Accumulated other comprehensive earnings, unfunded post retirement benefit obligation, tax effect	12,592,000	9,094,000
Cooperative advertising allowances recognized	9,190,000	8,898,000	10,715,000
Advertising costs	$ 208,295,000	$ 202,405,000	$ 191,788,000
Computer Software
Summary Of Significant Accounting Policies [Line Items]
Useful life of computer software, years	3 years