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. 19, 2025	Apr. 20, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in AOCI on Derivatives (Effective Portion)	[1]	$ (1,086)	$ (566)
Production costs		778,346	797,186
Income before income taxes		71,202	96,095
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Income before income taxes	[2]	489	(550)
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in AOCI on Derivatives (Effective Portion)	[1]	3,160
Interest Rate Contracts | Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	[2]	170	115
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) or Gain Recognized in AOCI on Derivatives (Effective Portion)	[1]	(4,246)	(566)
Commodity Contract | Reclassification out of Accumulated Other Comprehensive Income | Product
Derivative Instruments, Gain (Loss) [Line Items]
Production costs	[2],[3]	$ 320	$ (665)

[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).