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Benefit Plans - Benefit Plan Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Change in fair value of plan assets: |  |  |
Beginning balance | $ 183,486 |  |
Surplus assets | 12,400 |  |
Ending balance | 78,480 | $ 183,486 |
Incremental benefit payments | 100,000 |  |
Actuarial net loss | $ 900 |  |
Payable maximum period to be considered current | 12 months |  |
Components of net periodic benefit cost [Abstract] |  |  |
Net periodic benefit (income) cost | $ (3,013) | (465) | $ (2,914)
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 | 4.30% |  |
Maximum [Member] |  |  |
Weighted average assumptions in net periodic benefit calculations [Abstract] |  |  |
Annual assumed rate of increase in the per capita cost of covered benefits | 8.70% |  |
Pension Plan [Member] |  |  |
Change in benefit obligation [Roll Forward] |  |  |
Obligation at beginning of year | $ 182,164 | 166,739 |
Service cost | 0 | 0 | 88
Interest cost | 3,260 | 5,972 | 5,745
Actuarial loss (gain) | 10,790 | 17,061 |
Plan amendments | 0 | 0 |
Benefit payments | (9,214) | (9,883) |
Curtailment | 0 | 0 |
Settlement | (99,585) | 0 |
Foreign currency translation adjustment | 3,394 | 2,275 |
Obligation at end of year | 90,809 | 182,164 | 166,739
Change in fair value of plan assets: |  |  |
Beginning balance | 183,486 | 164,603 |
Actual return on plan assets | 13,313 | 26,734 |
Employer contributions | 0 | 0 |
Benefit payments | (9,214) | (9,883) |
Settlement | (99,585) | 0 |
Surplus assets | 12,386 | 0 |
Foreign currency translation adjustment | 2,866 | 2,032 |
Ending balance | 78,480 | 183,486 | 164,603
Funded (underfunded) status at end of year | (12,329) | 1,322 |
Plan termination, termination costs | 17,800 |  |
Plan termination, federal excise tax | 6,200 |  |
Unrecognized net actuarial loss (gain) | 26,476 | 36,195 |
Unrecognized prior service credit | 0 | 0 |
Funded status of the plans recognized [Abstract] |  |  |
Long-term asset | 0 | 8,592 |
Current liability | 0 | 0 |
Long-term liability | (12,329) | (7,270) |
Total (underfunded) funded status | (12,329) | 1,322 |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 0 | 0 | 88
Interest cost | 3,260 | 5,972 | 5,745
Expected return on plan assets | (5,704) | (8,103) | (9,522)
Amortization of net (gain) loss | 2,305 | 1,950 | 1,151
Settlement charge | 11,642 | 0 | 0
Net periodic benefit (income) cost | $ 11,503 | $ (181) | $ (2,538)
Weighted average assumptions in benefit obligations calculations [Abstract] |  |  |
Discount rate | 1.40% | 1.93% |
Expected long-term return on plan assets | 4.69% | 3.84% |
Rate of inflation | 3.20% | 3.20% |
Weighted average assumptions in net periodic benefit calculations [Abstract] |  |  |
Discount rate | 1.93% | 3.72% | 3.22%
Expected long-term return on plan assets | 3.84% | 5.05% | 5.27%
Rate of inflation | 3.20% | 3.40% | 3.30%
Other Postretirement Benefits Plan [Member] |  |  |
Change in benefit obligation [Roll Forward] |  |  |
Obligation at beginning of year | $ 12,653 | $ 14,382 |
Service cost | 212 | 260 | $ 235
Interest cost | 430 | 609 | 447
Actuarial loss (gain) | 422 | (1,860) |
Plan amendments | (26) | 0 |
Benefit payments | (716) | (832) |
Curtailment | (183) | 0 |
Settlement | 0 | (198) |
Foreign currency translation adjustment | (10) | 292 |
Obligation at end of year | 12,782 | 12,653 | 14,382
Change in fair value of plan assets: |  |  |
Beginning balance | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 716 | 832 |
Benefit payments | (716) | (832) |
Settlement | 0 | 0 |
Surplus assets | 0 | 0 |
Foreign currency translation adjustment | 0 | 0 |
Ending balance | 0 | 0 | 0
Funded (underfunded) status at end of year | (12,782) | (12,653) |
Unrecognized net actuarial loss (gain) | (1,187) | (1,609) |
Unrecognized prior service credit | (2,401) | (5,485) |
Funded status of the plans recognized [Abstract] |  |  |
Long-term asset | 0 | 0 |
Current liability | (948) | (1,013) |
Long-term liability | (11,834) | (11,640) |
Total (underfunded) funded status | (12,782) | (12,653) |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 212 | 260 | 235
Interest cost | 430 | 609 | 447
Amortization of net (gain) loss | (193) | (88) | 92
Amortization of prior service credit | (519) | (902) | (902)
Curtailment gain | (2,591) | 0 | 0
Settlement charge | 0 | (2) | 38
Net periodic benefit (income) cost | $ (2,661) | $ (123) | $ (90)
Weighted average assumptions in benefit obligations calculations [Abstract] |  |  |
Discount rate | 2.92% | 3.70% |
Rate of compensation increases | 5.00% | 5.00% |
Weighted average assumptions in net periodic benefit calculations [Abstract] |  |  |
Discount rate | 3.70% | 4.56% | 3.89%
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 | 100.00% | 43.00% |
Percent above plan assets on company sponsored UK pension plan | 100.00% | 39.00% |

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