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Pension and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Mar. 31, 2021
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 March 31,
| Pension |  | Other Postretirement
| 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 1,983 |  |  | $ | 2,170 |  |  | $ | 50 |  |  | $ | 64 |
Interest cost * | 1,546 |  |  | 1,933 |  |  | 94 |  |  | 140 |
Expected return on plan assets * | (2,762) |  |  | (2,232) |  |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |
Prior service cost | (41) |  |  | (47) |  |  | (91) |  |  | (23) |
Net actuarial loss * | 3,023 |  |  | 2,386 |  |  | — |  |  | — |
Net benefit cost | $ | 3,749 |  |  | $ | 4,210 |  |  | $ | 53 |  |  | $ | 181 |
| Six months ended March 31,
| Pension |  | Other Postretirement
| 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 4,196 |  |  | $ | 4,340 |  |  | $ | 100 |  |  | $ | 128 |
Interest cost * | 3,094 |  |  | 3,866 |  |  | 188 |  |  | 280 |
Expected return on plan assets * | (5,525) |  |  | (4,464) |  |  | — |  |  | — |
Amortization: |  |  |  |  |  |  |
Prior service cost | (58) |  |  | (94) |  |  | (182) |  |  | (46) |
Net actuarial loss * | 6,044 |  |  | 4,773 |  |  | — |  |  | — |
Net benefit cost | $ | 7,751 |  |  | $ | 8,421 |  |  | $ | 106 |  |  | $ | 362 |
* Non-service components of pension and postretirement expense are included in other income (deductions), net.
Contributions Made and Anticipated for the Current Fiscal Year | Contributions made and anticipated for fiscal year 2021 are as follows:
Contributions |  | Pension |  | Other Postretirement
Contributions during the six months ended March 31, 2021: |  |  |  |
Supplemental retirement plan |  | $ | 408 |  |  | $ | — |
Other postretirement plan |  | — |  |  | 228 |
Additional contributions expected in fiscal 2021: |  |  |  |
Principal retirement plan * |  | $ | 15,000 |  |  | $ | — |
Supplemental retirement plan |  | 497 |  |  | — |
Other postretirement plan |  | — |  |  | 603 |
* Contribution was made in April 2021 (see above).

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- Definition Tabular disclosure of contributions made and anticipated for the current fiscal year, for pension and other postretirement plans. + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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