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Pension Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 78,385 | $ 72,063
Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 24,013 | 20,663
Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 2,924 | 3,599
Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 27,078 | 23,878
Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 8,558 | 7,750
Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 9,105 | 9,131
Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,122 | 1,126
Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 5,585 | 5,916
Level 1 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 69,280 | 62,932
Level 1 | Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 24,013 | 20,663
Level 1 | Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 2,924 | 3,599
Level 1 | Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 27,078 | 23,878
Level 1 | Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 8,558 | 7,750
Level 1 | Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,122 | 1,126
Level 1 | Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 5,585 | 5,916
Level 2 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 9,105 | 9,131
Level 2 | Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 9,105 | $ 9,131

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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 http://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 http://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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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