Effect of Derivative Instruments for Deferred Gains And (Losses) on Closed Contracts and Effective Portion in Fair Value on AOCI, Utilized for Risk Management Purposes (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 13, 2019	Jul. 14, 2018	Jul. 13, 2019	Jul. 14, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivatives(Effective Portion)	[1]	$ 12,140	$ (8,809)	$ 2,547	$ 1,661
Production costs		508,552	488,871	1,160,693	1,113,993
Income before income taxes		69,046	49,779	155,111	119,560
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Income before income taxes	[2]	(945)	126	(3,123)	423
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	[2]	25	25	58	58
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivatives(Effective Portion)	[1]	12,140	(8,809)	2,547	1,661
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income | Product
Derivative Instruments, Gain (Loss) [Line Items]
Production costs	[2],[3]	$ (970)	$ 101	$ (3,181)	$ 365

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

[2] Amounts in parentheses, if any, indicate credits to determine net income (loss).

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