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Pension Plans and Other Postretirement Benefits | 9 Months Ended
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Jun. 24, 2023
Retirement Benefits [Abstract] |
Pension Plans and Other Postretirement Benefits | 15. Pension Plans and Other Postretirement Benefits The following table provides the components of net periodic benefit costs:
|  | Pension Benefits |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 24, |  |  | June 25, |  |  | June 24, |  |  | June 25, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Interest cost |  | $ | 827 |  |  | $ | 559 |  |  | $ | 2,480 |  |  | $ | 1,678 |
Expected return on plan assets |  |  | (339 | ) |  |  | (353 | ) |  |  | (1,016 | ) |  |  | (1,061 | )
Amortization of net loss |  |  | 482 |  |  |  | 598 |  |  |  | 1,445 |  |  |  | 1,797 |
Pension settlement charge |  |  | — |  |  |  | 634 |  |  |  | — |  |  |  | 634 |
Net periodic benefit cost |  | $ | 970 |  |  | $ | 1,438 |  |  | $ | 2,909 |  |  | $ | 3,048 |
|  | Postretirement Benefits |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | June 24, |  |  | June 25, |  |  | June 24, |  |  | June 25, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Interest cost |  | $ | 41 |  |  | $ | 20 |  |  | $ | 124 |  |  | $ | 60 |
Amortization of prior service credits |  |  | (124 | ) |  |  | (124 | ) |  |  | (373 | ) |  |  | (373 | )
Amortization of net (gain) |  |  | (194 | ) |  |  | (181 | ) |  |  | (581 | ) |  |  | (543 | )
Net periodic benefit cost |  | $ | (277 | ) |  | $ | (285 | ) |  | $ | (830 | ) |  | $ | (856 | )
The Partnership expects to voluntarily contribute approximately $4,000 to the defined benefit pension plan during fiscal 2023, of which $3,000 was contributed during the nine months ended June 24, 2023. The projected annual contribution requirements related to the Partnership’s postretirement health care and life insurance benefit plan for fiscal 2023 is $627, of which $329 was contributed during the nine months ended June 24, 2023. The components of net periodic benefit cost are included in the line item “Other, net” in the condensed consolidated statements of operations. The Partnership contributes to multi-employer pension plans (“MEPPs”) in accordance with various collective bargaining agreements covering union employees. As one of the many participating employers in these MEPPs, the Partnership is responsible with the other participating employers for any plan underfunding. As of June 24, 2023 and September 24, 2022, the Partnership’s estimated obligation to these MEPPs was $21,675 an d $22,496, respectively, as a result of its voluntary full withdrawal from certain MEPPs.

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