Effect of Derivative Instruments Designated as Cash-Flow Hedges in Other Comprehensive Income (Loss) ("OCI") and Condensed Consolidated Income Statement (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 18, 2015	Jul. 12, 2014	Jul. 18, 2015	Jul. 12, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	[1]	$ 5,818	$ (16,202)	$ 1,390	$ (900)
Amount of (Gain) or Loss Reclassified from Accumulated OCI into Income (Effective Portion)(Net of tax)	[1]	1,251	442	2,838	3,514
Interest Rate Contracts | Interest Expense (Income)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) or Loss Reclassified from Accumulated OCI into Income (Effective Portion)(Net of tax)	[1]	35	35	82	82
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	[1]	5,818	(16,202)	1,390	(900)
Commodity Contract | Production Costs
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) or Loss Reclassified from Accumulated OCI into Income (Effective Portion)(Net of tax)	[1],[2]	$ 1,216	$ 407	$ 2,756	$ 3,432

[1] Amounts in parentheses indicate debits to determine net income.

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