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		4 Months Ended
		Apr. 20, 2024	Apr. 22, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in AOCI on Derivatives (Effective Portion)	[1]	$ (566)	$ (3,044)
Production costs		797,186	800,852
Income before income taxes		96,095	89,965
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Income before income taxes	[2]	(550)	(940)
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	[2]	115	115
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in AOCI on Derivatives (Effective Portion)	[1]	(566)	(3,044)
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income | Product
Derivative Instruments, Gain (Loss) [Line Items]
Production costs	[2],[3]	$ (665)	$ (1,055)

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

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

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