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Summary of Significant Accounting Policies - Average Depreciation, Depletion and Amortization Rates (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Exploration and Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion and amortization rate (in dollars per Mcfe of production) | [1] | $ 0.71 | $ 0.65 | $ 0.59
Pipeline and Storage |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Average depreciation, depletion and amortization rates |  | 2.70% | 2.60% | 2.70%
Gathering |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Average depreciation, depletion and amortization rates |  | 3.60% | 3.60% | 3.60%
Utility |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Average depreciation, depletion and amortization rates |  | 2.80% | 2.70% | 2.70%
All Other and Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Average depreciation, depletion and amortization rates |  | 3.00% | 2.90% | 1.40%
Exploration and Production Properties |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion and amortization rate (in dollars per Mcfe of production) |  | $ 0.69 | $ 0.63 | $ 0.57
[1] | Amounts include depletion of exploration and production properties as well as depreciation of fixed assets. As disclosed in Note N — Supplementary Information for Exploration and Production Activities, depletion of exploration and production properties amounted to $0.69, $0.63 and $0.57 per Mcfe of production in 2024, 2023 and 2022, respectively.

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