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Asset Retirement Obligations (Tables) | 12 Months Ended
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Sep. 30, 2025
Asset Retirement Obligation [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following is a reconciliation of the change in the Company’s asset retirement obligations:
| Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (Thousands)
Balance at Beginning of Year | $ | 203,006 |  |  | $ | 165,492 |  |  | $ | 161,545 |
Liabilities Incurred | 5,210 |  |  | 2,367 |  |  | 3,313 |
Revisions of Estimates | 56,570 |  |  | 51,967 |  |  | 6,728 |
Liabilities Settled | (38,862) |  |  | (25,556) |  |  | (14,448) |
Accretion Expense | 10,863 |  |  | 8,736 |  |  | 8,354 |
Balance at End of Year | $ | 236,787 |  |  | $ | 203,006 |  |  | $ | 165,492 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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