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v3.23.1

Pension, Postretirement and Postemployment Defined Benefit Plans (Tables) | 6 Months Ended
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Mar. 26, 2023
Retirement Benefits [Abstract] |
Schedule of Net Periodic Pension and Postretirement Cost (Benefit) Components | 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) |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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