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Employee Benefit Plans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 USD ($) plan | Dec. 31, 2016 USD ($) | Jan. 02, 2016 USD ($)
Fair Value Measurement [Domain] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | $ 134,909 |  |
Fair value of plan assets at end of period |  | 150,517 | $ 134,909 |
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 85,936 |  |
Fair value of plan assets at end of period |  | 97,425 | 85,936 |
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 7,887 |  |
Fair value of plan assets at end of period |  | 6,501 | 7,887 |
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 2,783 |  |
Fair value of plan assets at end of period |  | 3,375 | 2,783 |
Projected benefit obligation at beginning of period |  | 189,290 | 182,276 |
Service cost |  | 3,043 | 2,549 | $ 6,638
Interest cost |  | 6,711 | 6,950 | 10,536
Employee contributions |  | 436 | 439 |
Employee contributions |  | 436 | 439 |
Plan amendments |  | (8) | 101 |
Actuarial loss/(gain) |  | 8,051 | 7,905 |
Benefits paid |  | (7,063) | (7,146) |
Effect of curtailment |  | 0 | (1,286) |
Effect of settlement |  | (884) | (953) |
Other |  | 5,152 | (1,545) |
Projected benefit obligation at end of period |  | 204,728 | 189,290 | 182,276
Fair value of plan assets at beginning of period |  | 134,909 | 127,970 |
Actual return on plan assets |  | 19,030 | 10,138 |
Employer contributions |  | 4,214 | 5,250 |
Benefits paid |  | 7,063 | 7,146 |
Effect of settlement |  | (884) | (953) |
Defined Benefit Plan, Plan Assets, Divestiture |  | (2,262) | 0 |
Other |  | 2,137 | (789) |
Fair value of plan assets at end of period |  | 150,517 | 134,909 | 127,970
Funded status |  | (54,211) | (54,381) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |
Current liability |  | (1,440) | (1,229) |
Noncurrent liability |  | (52,771) | (53,152) |
Net amount recognized |  | (54,211) | (54,381) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |  |
Net actuarial loss |  | 43,651 | 52,525 |
Prior service cost/(credit) |  | 371 | 417 |
Net amount recognized | [1] | 44,022 | 52,942 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax |  | 16,300 | 19,400 |
Accumulated benefit obligation |  | 192,192 | 181,340 |
Net pension cost includes the following components: |  |  |  |
Service cost |  | 3,043 | 2,549 | 6,638
Interest cost |  | 6,711 | 6,950 | 10,536
Expected return on plan assets |  | (7,181) | (7,552) | (12,229)
Net amortization and deferral |  | 4,821 | 4,668 | 5,034
Curtailment |  | 0 | (1,285) | (1,181)
Settlement |  | 42 | (114) | (2,353)
Net pension cost |  | 7,436 | 5,216 | 6,445
Amounts recognized in accumulated other comprehensive income (loss): |  |  |  |
Amortization of actuarial loss |  | 2,985 | 2,846 | 3,115
Actuarial (loss)/gain recognized |  | 2,763 | (3,861) | (2,323)
Amortization of settlement |  | 27 | (69) | 3,823
Amortization of prior service costs |  | 24 | 24 | (31)
Amortization of curtailment |  |  |  | (853)
Other |  | 30 | 44 | 471
Pension adjustments |  | 5,829 | $ (1,016) | $ 4,202
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension cost in fiscal 2012: |  |  |  |
Net actuarial loss |  | 3,556 |  |
Prior service cost |  | 35 |  |
Total |  | $ 3,591 |  |
Weighted average assumptions used to determine benefit obligations: |  |  |  |
Discount rate |  | 3.40% | 3.81% | 4.13%
Rate of compensation increase |  | 0.38% | 0.38% | 0.31%
Weighted average assumptions used to determine net periodic benefit cost for the employee benefit pension plans: |  |  |  |
Discount rate |  | 3.49% | 3.55% | 3.47%
Rate of increase in future compensation levels |  | 0.43% | 0.84% | 0.38%
Expected long-term rate of return on assets |  | 6.17% | 6.52% | 6.62%
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |  |
2018 |  | $ 9,780 |  |
2019 |  | 9,790 |  |
2020 |  | 9,641 |  |
2021 |  | 11,385 |  |
2022 |  | 11,098 |  |
Years 2023 – 2027 |  | 61,843 |  |
Multiemployer Plans [Abstract] |  |  |  |
Contributions |  | $ 3,472 | $ 3,373 | $ 3,231
Number Of Multiemployer Plans, Withdrawal Obligation | plan |  | 2 |  |
Multiemployer Plans, Withdrawal Obligation |  | $ 1,700 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 2,783 | 2,320 |
Fair value of plan assets at end of period |  | 3,375 | 2,783 | 2,320
Western Conference Of Teamsters Pension Plan [Member] |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |
Contributions | [2] | 1,524 | 1,456 | 1,387
Central States, Southeast and Southwest Areas Pension Plan [Member] |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |
Contributions | [3],[4] | 968 | 934 | 858
Other Multiemployer Plans [Member] |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |
Contributions |  | $ 980 | 983 | $ 986
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 |  | $ 96,606 |  |
Fair value of plan assets at end of period |  | 107,301 | 96,606 |
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 |  | 85,936 |  |
Fair value of plan assets at end of period |  | 97,425 | 85,936 |
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 |  | 7,887 |  |
Fair value of plan assets at end of period |  | 6,501 | 7,887 |
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 |  | 2,783 |  |
Fair value of plan assets at end of period |  | 3,375 | 2,783 |
Estimate of Fair Value Measurement [Member] | Fixed Income, Long Term [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 17,408 |  |
Fair value of plan assets at end of period |  | 23,231 | 17,408 |
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 |  | 17,408 |  |
Fair value of plan assets at end of period |  | 23,231 | 17,408 |
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 |  | 2,825 |  |
Fair value of plan assets at end of period |  | 1,869 | 2,825 |
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 |  | 2,825 |  |
Fair value of plan assets at end of period |  | 1,869 | 2,825 |
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 |  | 41,300 |  |
Fair value of plan assets at end of period |  | 44,173 | 41,300 |
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 |  | 41,300 |  |
Fair value of plan assets at end of period |  | 44,173 | 41,300 |
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 |  | 24,403 |  |
Fair value of plan assets at end of period |  | 28,152 | 24,403 |
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 |  | 24,403 |  |
Fair value of plan assets at end of period |  | 28,152 | 24,403 |
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 |  | 10,670 |  |
Fair value of plan assets at end of period |  | 9,876 | 10,670 |
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 |  | 7,887 |  |
Fair value of plan assets at end of period |  | 6,501 | 7,887 |
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 |  | 2,783 |  |
Fair value of plan assets at end of period |  | 3,375 | 2,783 |
Portion at Other than Fair Value Measurement [Member] |  |  |  |
Change in plan assets: |  |  |  |
Fair value of plan assets at beginning of period |  | 38,303 |  |
Fair value of plan assets at end of period |  | $ 43,216 | $ 38,303 |
[1] | Amounts do not include deferred taxes of $16.3 million and $19.4 million at December 30, 2017 and December 31, 2016, 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. Certain of these agreements have expired and are being renegotiated with others having expiration dates through April 1, 2020.
[3] | In July 2005 this plan received a 10 year extension from the IRS for amortizing unfunded liabilities.
[4] | 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 6, 2018.

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