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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Recorded Unconditional Purchase Obligation [Line Items] |  |
Estimate minimum liability for environmental remediation | $ 2,400 |
Other regulatory liabilities | 749,574 | $ 711,697
Future purchase obligation first year | 215,600 |
Future purchase obligation second year | 88,400 |
Future purchase obligation third year | 93,200 |
Future purchase obligation fourth year | 113,100 |
Future purchase obligation fifth year | 116,400 |
Future purchase obligation thereafter | 663,200 |
Environmental Site Remediation Costs |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Other regulatory liabilities | 5,400 |
Pipeline and Storage, Gathering and Utility Segments |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contract commitments first year | 86,300 |
Contract commitments second year | 8,700 |
Contract commitments third year | 6,500 |
Contract commitments fourth year | 3,800 |
Contract commitments fifth year | 3,800 |
Contract commitments thereafter | 3,900 |
Exploration and Production |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contract commitments first year | 218,600 |
Contract commitments second year | 73,600 |
Contract commitments third year | $ 13,900 |

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