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Pension, Postretirement and Postemployment Defined Benefit Plans
 3 Months Ended
Dec. 25, 2022
Retirement Benefits [Abstract]  
Pension, Postretirement and Postemployment Defined Benefit Plans PENSION, POSTRETIREMENT AND POSTEMPLOYMENT DEFINED BENEFIT PLANSWe have two defined benefit pension plans that together cover certain employees, including plans established under collective bargaining agreements. Additionally, we provide retiree medical and life insurance benefits under postretirement plans at several of our operating locations. Through
December 25, 2022, our liability and related expense for benefits under the plans are recorded over the service period of employees based upon annual actuarial calculations.
The net periodic pension and postretirement cost (benefit) components for our plans are as follows:
PENSION PLANSThree months ended
(Thousands of Dollars)December 25,
2022		December 26,
2021
Service cost for benefits earned during the period5 456 
Interest cost on projected benefit obligation2,592 1,936 
Expected return on plan assets(2,548)(4,536)
Amortization of net (gain) loss2 (1,259)
Amortization of prior service benefit213 — 
Curtailment gain— (1,027)
Pension benefit264 (4,430)
POSTRETIREMENT MEDICAL PLANSThree months ended
(Thousands of Dollars)December 25,
2022		December 26,
2021
Service cost for benefits earned during the period17 27 
Interest cost on projected benefit obligation149 85 
Expected return on plan assets(295)(263)
Amortization of net gain(254)(249)
Amortization of prior service benefit(162)(162)
Postretirement medical benefit(545)(562)
In the three months ended December 25, 2022 and December 26, 2021, we made no contributions to our pension plans. We have no required contributions to our pension plans for 2023.
Multiemployer Pension Plans
In prior periods, the Company effectuated withdrawals from several multiemployer plans. As of December 25, 2022, and September 25, 2022, we had $23.7 million and $25.0 million of accrued withdrawal liabilities. The liabilities reflect the estimated value of payments to the fund, payable over 20-years.