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Employee Benefit Plans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2019 USD ($) plan | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($)
Fair Value Measurement [Domain] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | $ 133,861 |  |
Fair value of plan assets at end of period |  | 155,702 | $ 133,861 |
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 85,639 |  |
Fair value of plan assets at end of period |  | 104,189 | 85,639 |
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 6,299 |  |
Fair value of plan assets at end of period |  | 5,792 | 6,299 |
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 3,337 |  |
Fair value of plan assets at end of period |  | 4,474 | 3,337 |
Projected benefit obligation at beginning of period |  | 190,666 | 204,728 |
Service cost |  | 2,696 | 3,064 | $ 3,043
Interest cost |  | 6,828 | 6,443 | 6,711
Employee contributions |  | 368 | 410 |
Employee contributions |  | 368 | 410 |
Actuarial loss/(gain) |  | 20,927 | (12,235) |
Benefits paid |  | (8,120) | (7,799) |
Effect of curtailment |  | (43) | (474) |
Effect of settlement |  | (903) | (280) |
Other |  | (154) | (3,191) |
Projected benefit obligation at end of period |  | 212,265 | 190,666 | 204,728
Fair value of plan assets at beginning of period |  | 133,861 | 150,517 |
Actual return on plan assets |  | 26,014 | (11,922) |
Employer contributions |  | 4,343 | 4,538 |
Benefits paid |  | (8,120) | (7,799) |
Effect of settlement |  | (903) | (331) |
Other |  | 139 | (1,552) |
Fair value of plan assets at end of period |  | 155,702 | 133,861 | 150,517
Funded status |  | (56,563) | (56,805) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |
Current liability |  | (1,072) | (1,173) |
Noncurrent liability |  | (55,491) | (55,632) |
Net amount recognized |  | (56,563) | (56,805) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |  |
Net actuarial loss |  | 45,062 | 47,501 |
Prior service cost |  | 295 | 351 |
Net amount recognized | [1] | 45,357 | 47,852 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax |  | 11,400 | 12,300 |
Accumulated benefit obligation |  | 201,708 | 181,642 |
Net pension cost includes the following components: |  |  |  |
Service cost |  | 2,696 | 3,064 | 3,043
Interest cost |  | 6,828 | 6,443 | 6,711
Expected return on plan assets |  | (7,270) | (8,226) | (7,181)
Net amortization and deferral |  | 4,605 | 3,578 | 4,821
Curtailment |  | (33) | (263) | 0
Settlement |  | 66 | 47 | 42
Net pension cost |  | 6,892 | 4,643 | 7,436
Amounts recognized in accumulated other comprehensive income (loss): |  |  |  |
Amortization of actuarial loss |  | 3,428 | 2,633 | 2,985
Actuarial (loss)/gain recognized |  | (1,991) | (5,886) | 2,763
Amortization of settlement |  | 50 | (2) | 27
Amortization of prior service costs |  | 25 | 26 | 24
Amortization of curtailment |  | 0 | 498 |
Other |  | 16 | 9 | 30
Pension adjustments |  | 1,535 | $ (2,730) | $ 5,829
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension cost in fiscal 2012: |  |  |  |
Net actuarial loss |  | 3,417 |  |
Prior service cost |  | 33 |  |
Total |  | $ 3,450 |  |
Weighted average assumptions used to determine benefit obligations: |  |  |  |
Discount rate |  | 2.77% | 3.68% | 3.40%
Rate of compensation increase |  | 0.40% | 0.42% | 0.38%
Weighted average assumptions used to determine net periodic benefit cost for the employee benefit pension plans: |  |  |  |
Discount rate |  | 3.33% | 2.30% | 3.49%
Rate of increase in future compensation levels |  | 0.42% | 0.36% | 0.43%
Expected long-term rate of return on assets |  | 6.13% | 6.13% | 6.17%
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |  |
2020 |  | $ 10,546 |  |
2021 |  | 10,498 |  |
2022 |  | 10,754 |  |
2023 |  | 10,675 |  |
2024 |  | 11,892 |  |
Years 2025 – 2029 |  | 64,147 |  |
Multiemployer Plans [Abstract] |  |  |  |
Contributions |  | $ 3,626 | $ 3,547 | $ 3,472
Number Of Multiemployer Plans, Withdrawal Obligation | plan |  | 5 |  |
Multiemployer Plans, Withdrawal Obligation |  | $ 6,000 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 3,337 | 3,375 |
Fair value of plan assets at end of period |  | 4,474 | 3,337 | 3,375
Western Conference Of Teamsters Pension Plan [Member] |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |
Contributions | [2] | 1,514 | 1,505 | 1,524
Central States, Southeast and Southwest Areas Pension Plan [Member] |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |
Contributions | [3],[4] | 916 | 978 | 968
Other Multiemployer Plans [Member] |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |
Contributions |  | $ 1,196 | 1,064 | $ 980
Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plan, Contributions To Individual Plan, Percent |  | 5.00% |  |
Estimate of Fair Value Measurement [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | $ 95,275 |  |
Fair value of plan assets at end of period |  | 114,455 | 95,275 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 85,639 |  |
Fair value of plan assets at end of period |  | 104,189 | 85,639 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 6,299 |  |
Fair value of plan assets at end of period |  | 5,792 | 6,299 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 3,337 |  |
Fair value of plan assets at end of period |  | 4,474 | 3,337 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 21,670 |  |
Fair value of plan assets at end of period |  | 16,154 | 21,670 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 21,670 |  |
Fair value of plan assets at end of period |  | 16,154 | 21,670 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Short Term [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 2,032 |  |
Fair value of plan assets at end of period |  | 3,448 | 2,032 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 2,032 |  |
Fair value of plan assets at end of period |  | 3,448 | 2,032 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Equity Securities, Domestic [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 37,223 |  |
Fair value of plan assets at end of period |  | 52,420 | 37,223 |
Estimate of Fair Value Measurement [Member] | Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 37,223 |  |
Fair value of plan assets at end of period |  | 52,420 | 37,223 |
Estimate of Fair Value Measurement [Member] | Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Equity Securities, International [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 24,714 |  |
Fair value of plan assets at end of period |  | 32,167 | 24,714 |
Estimate of Fair Value Measurement [Member] | Equity Securities, International [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 24,714 |  |
Fair value of plan assets at end of period |  | 32,167 | 24,714 |
Estimate of Fair Value Measurement [Member] | Equity Securities, International [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Equity Securities, International [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Insurance Contracts [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 9,636 |  |
Fair value of plan assets at end of period |  | 10,266 | 9,636 |
Estimate of Fair Value Measurement [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 6,299 |  |
Fair value of plan assets at end of period |  | 5,792 | 6,299 |
Estimate of Fair Value Measurement [Member] | Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 3,337 |  |
Fair value of plan assets at end of period |  | 4,474 | 3,337 |
Portion at Other than Fair Value Measurement [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 38,586 |  |
Fair value of plan assets at end of period |  | $ 41,247 | $ 38,586 |
[1] | Amounts do not include deferred taxes of $11.4 million and $12.3 million at December 28, 2019 and December 29, 2018, respectively.
[2] | The Company has several plants that participate in the Western Conference of Teamsters Pension Plan under collective bargaining agreements that require minimum funding contributions. The agreements have expiration dates through December 31, 2023.
[3] | The Company has several processing plants that participate in the Central States, Southeast and Southwest Areas Pension Plan under collective bargaining agreements that require minimum funding contributions. Certain of these agreements have expired and are being renegotiated with others having expiration dates through August 2, 2022.
[4] | In July 2005 this plan received a 10 year extension from the IRS for amortizing unfunded liabilities.

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