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Pension, Postretirement and Postemployment Defined Benefit Plans | 6 Months Ended
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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 PLANS | Three 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 period | 5 |  | 287 |  | 10 |  | 743 |
Interest cost on projected benefit obligation | 2,592 |  | 2,001 |  | 5,184 |  | 3,938 |
Expected return on plan assets | (2,548) |  | (4,535) |  | (5,096) |  | (9,071) |
Amortization of net (gain) loss | 2 |  | (687) |  | 4 |  | (1,946) |
Amortization of prior service benefit | 213 |  | 212 |  | 426 |  | 212 |
Curtailment gain | — |  | — |  | — |  | (1,027) |
Pension cost (benefit) | 264 |  | (2,722) |  | 528 |  | (7,151) |
POSTRETIREMENT MEDICAL PLANS | Three 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 period | 17 |  | 27 |  | 34 |  | 54 |
Interest cost on projected benefit obligation | 149 |  | 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. W e 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.

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