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Pension, Postretirement and Postemployment Defined Benefit Plans
 6 Months Ended
Mar. 26, 2023
Retirement Benefits [Abstract]  
Pension, Postretirement and Postemployment Defined Benefit Plans PENSION, POSTRETIREMENT AND POSTEMPLOYMENT DEFINED BENEFIT PLANS
We have a defined benefit pension plan that covers 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 March 26, 2023, 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 Six months ended
(Thousands of Dollars)March 26,
2023		March 27,
2022		March 26,
2023		March 27,
2022
Service cost for benefits earned during the period5 287 10 743 
Interest cost on projected benefit obligation2,592 2,001 5,184 3,938 
Expected return on plan assets(2,548)(4,535)(5,096)(9,071)
Amortization of net (gain) loss2 (687)4 (1,946)
Amortization of prior service benefit213 212 426 212 
Curtailment gain— — — (1,027)
Pension cost (benefit)264 (2,722)528 (7,151)
POSTRETIREMENT MEDICAL PLANSThree months ended Six months ended
(Thousands of Dollars)March 26,
2023		March 27,
2022		March 26,
2023		March 27,
2022
Service cost for benefits earned during the period17 27 34 54 
Interest cost on projected benefit obligation149 85 298 170 
Expected return on plan assets(295)(263)(590)(526)
Amortization of net gain(254)(249)(508)(498)
Amortization of prior service benefit(162)(162)(324)(324)
Postretirement medical benefit(545)(562)(1,090)(1,124)
In the six months ended March 26, 2023 and March 27, 2022, 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 March 26, 2023, and September 25, 2022, we had $23.4 million and $25.0 million of accrued withdrawal liabilities. The liabilities reflect the estimated value of payments to the fund, payable over 20 years.