Derivative Instruments Located on Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Oct. 06, 2012		Oct. 08, 2011		Oct. 06, 2012		Oct. 08, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)(Net of tax)	$ 39		$ (8,078)		$ 2,988		$ (17,078)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(2,677)		2,054		(16,737)		22,894
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)(Net of tax)	(23)		(69)		(1,606)		(504)
Interest Rate Contracts | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(378)		(551)		(1,379)		(1,923)
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)(Net of tax)	62		(8,009)		4,594		(16,574)
Commodity Contract | Production Costs
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (2,299)	[1]	$ 2,605	[1]	$ (15,358)	[1]	$ 24,817	[1]

[1] Included in Materials, supplies, labor and other production costs (exclusive of depreciation and amortization shown separately).