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Pension Plans - Percentage of Total Plan Assets (Details) - Pension Plan | Sep. 30, 2025 | Sep. 30, 2024
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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 | 19.00% | 12.00%
Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 57.00% | 62.00%
Commodity Option |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 6.00% | 6.00%
Insurance Company |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 8.00% | 9.00%
Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Category | 10.00% | 11.00%

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