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		9 Months Ended
		Oct. 05, 2019	Oct. 06, 2018	Oct. 05, 2019	Oct. 06, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivatives(Effective Portion)	[1]	$ (7,124)	$ 7,394	$ (4,577)	$ 9,055
Production costs		509,056	485,680	1,669,749	1,599,673
Income before income taxes		55,800	51,126	210,911	170,686
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Income before income taxes	[2]	259	266	(2,864)	689
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	[2]	25	25	83	83
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in AOCI on Derivatives(Effective Portion)	[1]	(7,124)	7,394	(4,577)	9,055
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income | Product
Derivative Instruments, Gain (Loss) [Line Items]
Production costs	[2],[3]	$ 234	$ 241	$ (2,947)	$ 606

[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).