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Pension Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 67,581 | $ 78,385
Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 20,430 | 24,013
Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 2,038 | 2,924
Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 22,379 | 27,078
Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 599 | 8,558
Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 6,823 | 9,105
Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,430 | 1,122
Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 13,882 | 5,585
Level 1 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 60,758 | 69,280
Level 1 | Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 20,430 | 24,013
Level 1 | Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 2,038 | 2,924
Level 1 | Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 22,379 | 27,078
Level 1 | Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 599 | 8,558
Level 1 | Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,430 | 1,122
Level 1 | Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 13,882 | 5,585
Level 2 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 6,823 | 9,105
Level 2 | Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 6,823 | $ 9,105

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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