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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 |

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