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Pension Plans - Percentage of Total Plan Assets (Details) - Pension Plan | Sep. 30, 2023 | Sep. 30, 2022
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Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 100.00% | 100.00%
Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 31.00% | 33.00%
Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 42.00% | 33.00%
Commodity Option |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 7.00% | 1.00%
Insurance Company |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 10.00% | 10.00%
Options |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 0.00% | 2.00%
Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 10.00% | 21.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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