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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following table sets forth, by level within the fair value hierarchy, the Company’s financial assets and liabilities (as applicable) that were accounted for at fair value on a recurring basis as of September 30, 2025 and 2024. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.
| At Fair Value as of September 30, 2025
Recurring Fair Value Measures | Level 1 |  | Level 2 |  | Level 3 |  | Netting Adjustments(1) |  | Total(1)
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |  |  |
Cash Equivalents — Money Market Mutual Funds | $ | 30,551 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 30,551 |
Derivative Financial Instruments: |  |  |  |  |  |  |  |  |
Over the Counter Swaps — Gas | — |  |  | 62,190 |  |  | — |  |  | (33,615) |  |  | 28,575 |
Over the Counter No Cost Collars — Gas | — |  |  | 24,149 |  |  | — |  |  | (12,805) |  |  | 11,344 |
Foreign Currency Contracts | — |  |  | 144 |  |  | — |  |  | (675) |  |  | (531) |
Other Investments: |  |  |  |  |  |  |  |  |
Balanced Equity Mutual Fund | 13,786 |  |  | — |  |  | — |  |  | — |  |  | 13,786 |
Fixed Income Mutual Fund | 10,082 |  |  | — |  |  | — |  |  | — |  |  | 10,082 |
Total | $ | 54,419 |  |  | $ | 86,483 |  |  | $ | — |  |  | $ | (47,095) |  |  | $ | 93,807 |
Liabilities: |  |  |  |  |  |  |  |  |
Derivative Financial Instruments: |  |  |  |  |  |  |  |  |
Over the Counter Swaps — Gas | $ | — |  |  | $ | 34,169 |  |  | $ | — |  |  | $ | (33,615) |  |  | $ | 554 |
Over the Counter No Cost Collars — Gas | — |  |  | 18,036 |  |  | — |  |  | (12,805) |  |  | 5,231 |
Foreign Currency Contracts | — |  |  | 893 |  |  | — |  |  | (675) |  |  | 218 |
Total | $ | — |  |  | $ | 53,098 |  |  | $ | — |  |  | $ | (47,095) |  |  | $ | 6,003 |
Total Net Assets/(Liabilities) | $ | 54,419 |  |  | $ | 33,385 |  |  | $ | — |  |  | $ | — |  |  | $ | 87,804 |
| At Fair Value as of September 30, 2024
Recurring Fair Value Measures | Level 1 |  | Level 2 |  | Level 3 |  | Netting Adjustments(1) |  | Total(1)
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |  |  |
Cash Equivalents — Money Market Mutual Funds | $ | 29,238 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 29,238 |
Derivative Financial Instruments: |  |  |  |  |  |  |  |  |
Over the Counter Swaps — Gas | — |  |  | 76,009 |  |  | — |  |  | (17,198) |  |  | 58,811 |
Over the Counter No Cost Collars — Gas | — |  |  | 32,584 |  |  | — |  |  | (3,774) |  |  | 28,810 |
Contingent Consideration for Asset Sale | — |  |  | 729 |  |  | — |  |  | — |  |  | 729 |
Foreign Currency Contracts | — |  |  | 281 |  |  | — |  |  | (726) |  |  | (445) |
Other Investments: |  |  |  |  |  |  |  |  |
Balanced Equity Mutual Fund | 19,523 |  |  | — |  |  | — |  |  | — |  |  | 19,523 |
Fixed Income Mutual Fund | 17,374 |  |  | — |  |  | — |  |  | — |  |  | 17,374 |
Total | $ | 66,135 |  |  | $ | 109,603 |  |  | $ | — |  |  | $ | (21,698) |  |  | $ | 154,040 |
Liabilities: |  |  |  |  |  |  |  |  |
Derivative Financial Instruments: |  |  |  |  |  |  |  |  |
Over the Counter Swaps — Gas | $ | — |  |  | $ | 22,206 |  |  | $ | — |  |  | $ | (17,198) |  |  | $ | 5,008 |
Over the Counter No Cost Collars — Gas | — |  |  | 3,501 |  |  | — |  |  | (3,774) |  |  | (273) |
Foreign Currency Contracts | — |  |  | 726 |  |  | — |  |  | (726) |  |  | — |
Total | $ | — |  |  | $ | 26,433 |  |  | $ | — |  |  | $ | (21,698) |  |  | $ | 4,735 |
Total Net Assets/(Liabilities) | $ | 66,135 |  |  | $ | 83,170 |  |  | $ | — |  |  | $ | — |  |  | $ | 149,305 |
(1)Netting Adjustments represent the impact of legally-enforceable master netting arrangements that allow the Company to net gain and loss positions held with the same counterparties. The net asset or net liability for each counterparty is recorded as an asset or liability on the Company’s balance sheet.
Schedule of Fair Value Measurements, Nonrecurring | The following table presents impairments of assets associated with certain nonrecurring fair value measurements within Level 3 of the fair value hierarchy as of September 30, 2025, 2024 and 2023 (in thousands):
|  |  |  |  |  |  | Impairments
Nonrecurring Fair Value Measures |  |  |  |  |  | Year Ended September 30,
| Segment |  | Date of Measurement |  | Fair Value |  | 2025 |  | 2024 |  | 2023
Impairment of Assets: |  |  |  |  |  |  |  |  |  |
Water Disposal Assets | Integrated Upstream and Gathering |  | December 31, 2024 |  | $ | 12,880 |  |  | $ | 33,453 |  |  | $ | — |  |  | $ | — |
Northern Access Project | Pipeline and Storage |  | September 30, 2024 |  | $ | 12,133 |  |  | — |  |  | 46,075 |  |  | — |
Water Disposal Assets | Integrated Upstream and Gathering |  | September 30, 2024 |  | $ | 3,000 |  |  | — |  |  | 9,362 |  |  | — |
Total Impairment |  | $ | 33,453 |  |  | $ | 55,437 |  |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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