Effect of Derivative Instruments Located on the Condensed Consolidated Statements of Income, Utilized for Risk Management Purposes (Detail) - USD ($) $ in Thousands		4 Months Ended
		Apr. 23, 2016	Apr. 25, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)(Net of tax)	[1]	$ 2,588	$ (4,428)
Amount of (Gain) or Loss Reclassified from Accumulated OCI into Income (Effective Portion)(Net of tax)	[1]	(1,143)	(1,587)
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]	(47)	(47)
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)(Net of tax)	[1]	2,588	(4,428)
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]	$ (1,096)	$ (1,540)

[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).