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Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Amortization: |  |  |  |  |
Settlement loss |  |  |  | $ 30,856 |
Employer contributions |  | $ 35,706 |  |  |
Benefit payments |  | 185,958 |  |  |
Annuity contracts purchased |  | $ 56,274 |  |  |
Pension |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | $ 5 |  | $ 1,983 | 385 | $ 4,196
Interest cost | 48 |  | 1,546 | 1,038 | 3,094
Expected return on plan assets | 0 |  | (2,762) | (1,042) | (5,525)
Amortization: |  |  |  |  |
Prior service credit | (66) |  | (41) | (19) | (58)
Net actuarial loss | 91 |  | 3,023 | 292 | 6,044
Settlement loss |  |  |  | 30,856 | 0
Net benefit cost | 78 |  | 3,749 | 31,510 | 7,751
Contributions during the six months ended March 31, 2022: |  |  |  |  |
Pension |  |  |  | 35,706 |
Other Postretirement |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |
Service cost | 41 |  | 50 | 82 | 100
Interest cost | 103 |  | 94 | 206 | 188
Expected return on plan assets | 0 |  | 0 | 0 | 0
Amortization: |  |  |  |  |
Prior service credit | (91) |  | (91) | (182) | (182)
Net actuarial loss | 0 |  | 0 | 0 | 0
Settlement loss |  |  |  | 0 | 0
Net benefit cost | 53 |  | $ 53 | 106 | $ 106
Contributions during the six months ended March 31, 2022: |  |  |  |  |
Other Postretirement |  |  |  | 340 |
Additional contributions expected in fiscal 2022: |  |  |  |  |
Additional contributions expected in fiscal 2022 | 544 |  |  | 544 |
Supplemental retirement plan |  |  |  |  |
Contributions during the six months ended March 31, 2022: |  |  |  |  |
Pension |  |  |  | 387 |
Additional contributions expected in fiscal 2022: |  |  |  |  |
Additional contributions expected in fiscal 2022 | $ 373 |  |  | $ 373 |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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