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Pension and Other Postretirement Benefit Plans (Tables) | 9 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Net Periodic Pension and Other Postretirement Benefit Cost | Net periodic pension and other postretirement benefit cost for the plans included the following:
| Three months ended June 30,
| Pension |  | Other Postretirement
| 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 30 |  |  | $ | 31 |  |  | $ | 14 |  |  | $ | 19 |
Interest cost * | 130 |  |  | 106 |  |  | 171 |  |  | 161 |
Amortization: |  |  |  |  |  |  |
Prior service credit | — |  |  | — |  |  | (91) |  |  | (92) |
Net actuarial gains * | (13) |  |  | (5) |  |  | (180) |  |  | (177) |
Net benefit cost | $ | 147 |  |  | $ | 132 |  |  | $ | (86) |  |  | $ | (89) |
| Nine months ended June 30,
| Pension |  | Other Postretirement
| 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 91 |  |  | $ | 119 |  |  | $ | 41 |  |  | $ | 57 |
Interest cost * | 388 |  |  | 354 |  |  | 513 |  |  | 483 |
Amortization: |  |  |  |  |  |  |
Prior service credit | — |  |  | — |  |  | (273) |  |  | (274) |
Net actuarial gains * | (33) |  |  | (21) |  |  | (541) |  |  | (531) |
Settlement losses * | — |  |  | 1,271 |  |  | — |  |  | — |
Net benefit cost | $ | 446 |  |  | $ | 1,723 |  |  | $ | (260) |  |  | $ | (265) |
* Non-service components of pension and postretirement expense are included in other income (deductions), net.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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