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Benefit Plans - Benefit Plan Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Change in fair value of plan assets: |  |  |
Beginning balance | $ 164,603 |  |
Ending balance | 183,486 | $ 164,603 |
Actuarial net loss | 1,600 |  |
Prior service credit | $ (900) |  |
Payable maximum period to be considered current | 12 months |  |
Components of net periodic benefit cost [Abstract] |  |  |
Net periodic benefit (income) cost | $ (465) | (2,914) | $ (1,150)
Weighted average assumptions in net periodic benefit calculations [Abstract] |  |  |
Ultimate health care cost trend rate | 4.10% |  |
Minimum [Member] |  |  |
Weighted average assumptions in net periodic benefit calculations [Abstract] |  |  |
Annual assumed rate of increase in the per capita cost of covered benefits | 4.00% |  |
Maximum [Member] |  |  |
Weighted average assumptions in net periodic benefit calculations [Abstract] |  |  |
Annual assumed rate of increase in the per capita cost of covered benefits | 7.00% |  |
Pension Plan [Member] |  |  |
Change in benefit obligation [Roll Forward] |  |  |
Obligation at beginning of year | $ 166,739 | 186,766 |
Service cost | 0 | 88 | 128
Interest cost | 5,972 | 5,745 | 6,344
Actuarial loss (gain) | 17,061 | (10,637) |
Benefit payments | (9,883) | (10,368) |
Settlement charge | 0 | 0 |
Foreign currency translation adjustment | 2,275 | (4,855) |
Obligation at end of year | 182,164 | 166,739 | 186,766
Change in fair value of plan assets: |  |  |
Beginning balance | 164,603 | 186,336 |
Actual return on plan assets | 26,734 | (8,282) |
Employer contributions | 0 | 999 |
Benefit payments | (9,883) | (10,368) |
Foreign currency translation adjustment | 2,032 | (4,082) |
Ending balance | 183,486 | 164,603 | 186,336
Funded (underfunded) status at end of year | 1,322 | (2,136) |
Unrecognized net actuarial loss | 36,195 | 39,101 |
Unrecognized prior service credit | 0 | 0 |
Funded status of the plans recognized [Abstract] |  |  |
Long-term asset | 8,592 | 10,580 |
Current liability | 0 | 0 |
Long-term liability | (7,270) | (12,716) |
Total funded (underfunded) status | 1,322 | (2,136) |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 0 | 88 | 128
Interest cost | 5,972 | 5,745 | 6,344
Expected return on plan assets | (8,103) | (9,522) | (9,374)
Amortization of net (gain) loss | 1,950 | 1,151 | 2,206
Net periodic benefit (income) cost | $ (181) | $ (2,538) | $ (696)
Weighted average assumptions in benefit obligations calculations [Abstract] |  |  |
Discount rate | 1.93% | 3.72% |
Expected long-term return on plan assets | 3.84% | 5.05% |
Rate of inflation | 3.20% | 3.40% |
Weighted average assumptions in net periodic benefit calculations [Abstract] |  |  |
Discount rate | 3.72% | 3.22% | 3.61%
Expected long-term return on plan assets | 5.05% | 5.27% | 5.56%
Rate of inflation | 3.40% | 3.30% | 3.30%
Other Postretirement Benefits Plan [Member] |  |  |
Change in benefit obligation [Roll Forward] |  |  |
Obligation at beginning of year | $ 14,382 | $ 16,407 |
Service cost | 260 | 235 | $ 235
Interest cost | 609 | 447 | 599
Actuarial loss (gain) | (1,860) | (1,185) |
Benefit payments | (832) | (892) |
Settlement charge | (198) | (171) |
Foreign currency translation adjustment | 292 | (459) |
Obligation at end of year | 12,653 | 14,382 | 16,407
Change in fair value of plan assets: |  |  |
Beginning balance | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 832 | 892 |
Benefit payments | (832) | (892) |
Foreign currency translation adjustment | 0 | 0 |
Ending balance | 0 | 0 | 0
Funded (underfunded) status at end of year | (12,653) | (14,382) |
Unrecognized net actuarial loss | (1,609) | 170 |
Unrecognized prior service credit | (5,485) | (6,387) |
Funded status of the plans recognized [Abstract] |  |  |
Long-term asset | 0 | 0 |
Current liability | (1,013) | (1,080) |
Long-term liability | (11,640) | (13,302) |
Total funded (underfunded) status | (12,653) | (14,382) |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 260 | 235 | 235
Interest cost | 609 | 447 | 599
Amortization of net (gain) loss | (88) | 92 | (42)
Amortization of prior service credit | (902) | (902) | (901)
Settlement charge | (2) | 38 | 17
Net periodic benefit (income) cost | $ (123) | $ (90) | $ (92)
Weighted average assumptions in benefit obligations calculations [Abstract] |  |  |
Discount rate | 3.70% | 4.56% |
Rate of compensation increases | 5.00% | 5.00% |
Weighted average assumptions in net periodic benefit calculations [Abstract] |  |  |
Discount rate | 4.56% | 3.89% | 4.21%
Rate of compensation increases | 5.00% | 5.00% | 5.00%
Foreign Plan [Member] | Pension Plan [Member] |  |  |
Change in fair value of plan assets: |  |  |
Percent of above benefit obligation on company sponsored UK pension plan | 43.00% | 45.00% |
Percent above plan assets on company sponsored UK pension plan | 39.00% | 37.00% |

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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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