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Pension Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 72,063 | $ 69,879
Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 20,663 | 26,996
Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 3,599 | 4,816
Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 23,878 | 22,648
Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 7,750 | 1,086
Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 9,131 | 8,494
Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,126 |
Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 5,916 | 5,839
Level 1 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 62,932 | 61,385
Level 1 | Government |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 20,663 | 26,996
Level 1 | Corporate Investment Grade |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 3,599 | 4,816
Level 1 | Large Capitalization Stocks |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 23,878 | 22,648
Level 1 | Commodity Option |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 7,750 | 1,086
Level 1 | Options |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 1,126 |
Level 1 | Cash |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 5,916 | 5,839
Level 2 |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | 9,131 | 8,494
Level 2 | Insurance Company Funds |  |
Fair Value of Plan Assets [Line Items] |  |
Fair value of plan assets | $ 9,131 | $ 8,494

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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=118255775&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=118255775&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=118255775&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=118257860&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=118255775&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=118255775&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=118255775&loc=d3e1928-114920 + Details
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