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Summary of Significant Accounting Policies - Schedule of Depreciable Plant by Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Depreciable plant | $ 13,998,897 | $ 13,101,006
Exploration and Production |  |
Segment Reporting Information [Line Items] |  |
Depreciable plant | 7,275,495 | 6,741,095
Pipeline and Storage |  |
Segment Reporting Information [Line Items] |  |
Depreciable plant | 2,919,506 | 2,803,690
Gathering |  |
Segment Reporting Information [Line Items] |  |
Depreciable plant | 1,142,000 | 1,032,969
Utility |  |
Segment Reporting Information [Line Items] |  |
Depreciable plant | 2,645,981 | 2,507,465
All Other and Corporate |  |
Segment Reporting Information [Line Items] |  |
Depreciable plant | $ 15,915 | $ 15,787

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- Definition Carrying amount at the balance sheet date for depreciable plant assets used in the normal conduct of business and not intended for resale. Amount does not include depreciation. + References No definition available. + Details
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