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Pension, Postretirement and Postemployment Benefits (Tables)
 12 Months Ended
Dec. 27, 2020
Retirement Benefits [Abstract]  
Summary of Changes in Projected Benefit Obligation, Plan Assets and Funded Status
Reconciliations of the beginning and ending balances for the projected benefit obligation, the fair value of plan assets and the funded status are included below for the years ended December 27, 2020 and December 29, 2019.
PensionPostretirement
2020201920202019
Change in Projected Benefit Obligation
Projected benefit obligation — beginning$30,971 395,718 27,443 30,081 
Service cost— 1,168 — 888 
Interest cost1,466 6,624 919 1,267 
Transfer in14,796 — — — 
Actuarial (gain) loss3,436 (8,092)3,382 6,350 
Benefits paid(4,637)(13,271)(1,797)(1,641)
Expenses paid— (3,172)— — 
Curtailment— — — (9,502)
Settlements paid— (348,004)— — 
Projected benefit obligation — ending$46,032 30,971 29,947 27,443 
Accumulated benefit obligation — ending$46,032 30,971 29,947 27,443 
Change in Plan Assets
Fair value of plan assets — beginning$— $357,224 — — 
Actual return on plan assets— 23,147 — — 
Employer contribution— 4,311 — — 
Benefits paid— (13,271)— — 
Expenses paid— (3,172)— — 
Settlements paid— (348,004)— — 
Transfers— (20,235)— — 
Fair value of plan assets — ending$— — — — 
Reconciliation of Funded Status
Projected benefit obligation$(46,032)(30,971)(29,947)(27,443)
Fair value of plan assets— — — — 
Funded status(46,032)(30,971)(29,947)(27,443)
Unrecognized net loss15,787 13,054 3,559 177 
Net amount$(30,245)(17,917)(26,388)(27,266)
Accrued liabilities$(3,232)(2,484)(1,740)(1,767)
Other liabilities(42,800)(28,487)(28,207)(25,676)
Accumulated other comprehensive (earnings) loss15,787 13,054 3,559 177 
Net amount$(30,245)(17,917)(26,388)(27,266)
Assumptions used to determine year-end pension and postretirement benefit obligations
Assumptions used to determine the year-end pension and postretirement benefit obligations are as follows:
20202019
Pension
Weighted average discount rate2.51 %3.30 %
Mortality tablePri-2012/Scale
MP - 2020		Pri-2012/Scale
MP - 2019
Postretirement
Discount rate2.72 %3.46 %
Health care cost trend rate assumed for next year6.25 %6.25 %
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)5.00 %5.00 %
Year that the rate reaches the ultimate trend20242024
Components of Net Periodic Benefit Cost
The following is a detail of the components of the net periodic benefit cost for the three years ended December 27, 2020.
202020192018
Components of Net Periodic Cost
Pension
Service cost$— 1,168 1,300 
Interest cost1,466 6,624 13,358 
Expected return on assets— (6,163)(18,475)
Amortization of prior service cost(11)(11)— 
Amortization of actuarial loss715 7,578 10,995 
Curtailment/Settlement losses— 110,962 — 
Net periodic benefit cost$2,170 120,158 7,178 
Postretirement
Service cost$— 888 756 
Interest cost919 1,267 1,171 
Amortization of actuarial loss— 21 165 
Net periodic benefit cost$919 2,176 2,092 
Assumptions Used to Determine Net Periodic Benefit Cost of Pension Plan and Postretirement Plan
Assumptions used to determine net periodic benefit cost of the pension plan and postretirement plan for each fiscal year follow:
202020192018
Pension
Weighted average discount rate3.33 %3.72 %3.71 %
Long-term rate of return on plan assetsN/A4.20 %4.75 %
Postretirement
Discount rate3.46 %4.33 %3.74 %
Health care cost trend rate assumed for next year6.25 %6.25 %6.50 %
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)5.00 %5.00 %5.00 %
Year that the rate reaches the ultimate trend rate202420242024
Schedule of Expected Benefit Payments
Expected benefit payments under the defined benefit pension plans (which reflects the 2019 Plan termination) and the postretirement benefit plan for the next five years subsequent to 2020 and in the aggregate for the following five years are as follows:
PensionPostretirement
2021$3,287 1,763 
20223,215 1,717 
20233,265 1,670 
20243,197 1,629 
20253,254 1,588 
2026-203014,778 7,362