Tax Effect of Temporary Differences That Give Rise to Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Deferred tax assets:
Self-insurance reserves	$ 118,276	$ 116,901
Retirement plan contributions	53,299	49,876
Postretirement benefit cost	41,384	46,688
Lease accounting	22,890	12,489
Inventory capitalization	13,178	11,768
Reserves not currently deductible	11,760	15,986
Other	11,626	10,556
Total deferred tax assets	272,413	264,264
Deferred tax liabilities:
Property, plant and equipment, primarily due to depreciation	507,308	497,932
Investment valuation	56,358	24,086
Other	9,942	11,706
Total deferred tax liabilities	$ 573,608	$ 533,724