Postretirement Plans - Additional Information (Detail) - USD ($)	3 Months Ended		4 Months Ended	12 Months Ended
	Dec. 28, 2024	Oct. 08, 2022	Apr. 20, 2024	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022	Jul. 19, 2022
Pension and Other Postretirement Benefits Disclosure [Line Items]
Settlement loss	$ 200,000
Expected pension cost for fiscal 2025	400,000			$ 400,000
Postretirement Benefits, minimum years of service for eligibility				10 years
Postretirement Benefits, minimum age for eligibility				60 years
Contributions to the MEPPs				$ 638,000	$ 592,000	$ 629,000
Collective bargaining agreement expires				Feb. 07, 2027
Contribution of pension fund in excess of total contribution				5.00%	5.00%	5.00%
Multiemployer plans, minimum contribution				$ 0
Multi-employer pension plan withdrawal liability	0			$ 0	$ 1,297,000		$ 1,300,000
Holsum Bakery
Pension and Other Postretirement Benefits Disclosure [Line Items]
Multi-employer pension plan withdrawal costs		$ 1,300,000	$ 1,400,000
Holsum Bakery | Selling, Distribution and Administrative Expenses
Pension and Other Postretirement Benefits Disclosure [Line Items]
Multi-employer pension plan additional withdrawal cost			$ 100,000
Minimum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Retiree medical coverage provided				3 years
Maximum
Pension and Other Postretirement Benefits Disclosure [Line Items]
Retiree medical coverage provided				5 years
Pension plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Settlement loss				$ (241,000)
Actual return (loss) on plan assets				$ 1,763,000	$ 3,328,000	$ (4,300,000)
Expected long-term rate of return and average annual return on plan assets				5.90%	5.90%	5.90%
Contribution of company to company pension plans				$ 249,000	$ 1,268,000	$ 1,271,000
Net periodic benefit cost (income)				642,000	655,000	716,000
Unfunded status	(5,246,000)			$ (5,246,000)	(4,578,000)
Last Fifteen Years
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expected long-term rate of return and average annual return on plan assets				0.90%
Administrative Expenses
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expected long-term rate of return and average annual return on plan assets				0.20%
Non Qualified Pension Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expected company contribution	200,000			$ 200,000
Plan No. 2
Pension and Other Postretirement Benefits Disclosure [Line Items]
Voluntarily contributions made by an employer					1,000,000	1,000,000
Expected long-term rate of return and average annual return on plan assets				5.30%
Postretirement Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Unfunded status	4,600,000			$ 4,600,000	4,600,000
Plan No. 1
Pension and Other Postretirement Benefits Disclosure [Line Items]
Voluntarily contributions made by an employer				0
Required | Pension plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contribution of company to company pension plans				249,000	268,000	271,000
Required | Non Qualified Pension Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contribution of company to company pension plans				300,000
Required | Plan No. 2
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expected company contribution	$ 0			0
Western Conference Of Teamsters Pension Trust
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions to the MEPPs				$ 300,000
Western Conference Of Teamsters Pension Trust | Multiemployer Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contributions to the MEPPs					300,000	700,000
Discretionary | Pension plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Contribution of company to company pension plans					$ 1,000,000	$ 1,000,000