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v3.25.3

Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables provide a disaggregation of the Company’s revenues for the years ended September 30, 2025, 2024 and 2023, presented by type of service from each reportable segment.
| Year Ended September 30, 2025
Revenues by Type of Service | Integrated Upstream and Gathering |  | Pipeline and Storage |  |  |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Eliminations |  | Total Consolidated
| (Thousands)
Production of Natural Gas | $ | 1,104,283 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 1,104,283 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,104,283 |
Production of Crude Oil | 1,837 |  |  | — |  |  |  |  | — |  |  | 1,837 |  |  | — |  |  | — |  |  | 1,837 |
Natural Gas Processing | 1,196 |  |  | — |  |  |  |  | — |  |  | 1,196 |  |  | — |  |  | — |  |  | 1,196 |
Natural Gas Gathering Service | 11,813 |  |  | — |  |  |  |  | — |  |  | 11,813 |  |  | — |  |  | — |  |  | 11,813 |
Natural Gas Transportation Service | — |  |  | 324,179 |  |  |  |  | 109,443 |  |  | 433,622 |  |  | — |  |  | (108,351) |  |  | 325,271 |
Natural Gas Storage Service | — |  |  | 100,292 |  |  |  |  | — |  |  | 100,292 |  |  | — |  |  | (42,485) |  |  | 57,807 |
Natural Gas Residential Sales | — |  |  | — |  |  |  |  | 596,988 |  |  | 596,988 |  |  | — |  |  | — |  |  | 596,988 |
Natural Gas Commercial Sales | — |  |  | — |  |  |  |  | 84,515 |  |  | 84,515 |  |  | — |  |  | — |  |  | 84,515 |
Natural Gas Industrial Sales | — |  |  | — |  |  |  |  | 4,403 |  |  | 4,403 |  |  | — |  |  | (4) |  |  | 4,399 |
Other | 18,050 |  |  | 3,130 |  |  |  |  | 10,813 |  |  | 31,993 |  |  | — |  |  | (985) |  |  | 31,008 |
Total Revenues from Contracts with Customers | 1,137,179 |  |  | 427,601 |  |  |  |  | 806,162 |  |  | 2,370,942 |  |  | — |  |  | (151,825) |  |  | 2,219,117 |
Alternative Revenue Programs | — |  |  | — |  |  |  |  | 11,467 |  |  | 11,467 |  |  | — |  |  | — |  |  | 11,467 |
Derivative Financial Instruments | 46,957 |  |  | — |  |  |  |  | — |  |  | 46,957 |  |  | — |  |  | — |  |  | 46,957 |
Total Revenues | $ | 1,184,136 |  |  | $ | 427,601 |  |  |  |  | $ | 817,629 |  |  | $ | 2,429,366 |  |  | $ | — |  |  | $ | (151,825) |  |  | $ | 2,277,541 |
| Year Ended September 30, 2024
Revenues by Type of Service | Integrated Upstream and Gathering |  | Pipeline and Storage |  |  |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Eliminations |  | Total Consolidated
| (Thousands)
Production of Natural Gas | $ | 738,778 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 738,778 |  |  | $ | — |  |  | $ | — |  |  | $ | 738,778 |
Production of Crude Oil | 2,298 |  |  | — |  |  |  |  | — |  |  | 2,298 |  |  | — |  |  | — |  |  | 2,298 |
Natural Gas Processing | 1,053 |  |  | — |  |  |  |  | — |  |  | 1,053 |  |  | — |  |  | — |  |  | 1,053 |
Natural Gas Gathering Service | 15,537 |  |  | — |  |  |  |  | — |  |  | 15,537 |  |  | — |  |  | — |  |  | 15,537 |
Natural Gas Transportation Service | — |  |  | 311,900 |  |  |  |  | 103,866 |  |  | 415,766 |  |  | — |  |  | (99,658) |  |  | 316,108 |
Natural Gas Storage Service | — |  |  | 95,933 |  |  |  |  | — |  |  | 95,933 |  |  | — |  |  | (40,995) |  |  | 54,938 |
Natural Gas Residential Sales | — |  |  | — |  |  |  |  | 502,744 |  |  | 502,744 |  |  | — |  |  | — |  |  | 502,744 |
Natural Gas Commercial Sales | — |  |  | — |  |  |  |  | 68,466 |  |  | 68,466 |  |  | — |  |  | — |  |  | 68,466 |
Natural Gas Industrial Sales | — |  |  | — |  |  |  |  | 3,103 |  |  | 3,103 |  |  | — |  |  | (5) |  |  | 3,098 |
Other | 1,937 |  |  | 4,560 |  |  |  |  | (1,256) |  |  | 5,241 |  |  | — |  |  | (902) |  |  | 4,339 |
Total Revenues from Contracts with Customers | 759,603 |  |  | 412,393 |  |  |  |  | 676,923 |  |  | 1,848,919 |  |  | — |  |  | (141,560) |  |  | 1,707,359 |
Alternative Revenue Programs | — |  |  | — |  |  |  |  | 20,439 |  |  | 20,439 |  |  | — |  |  | — |  |  | 20,439 |
Derivative Financial Instruments | 217,012 |  |  | — |  |  |  |  | — |  |  | 217,012 |  |  | — |  |  | — |  |  | 217,012 |
Total Revenues | $ | 976,615 |  |  | $ | 412,393 |  |  |  |  | $ | 697,362 |  |  | $ | 2,086,370 |  |  | $ | — |  |  | $ | (141,560) |  |  | $ | 1,944,810 |
| Year Ended September 30, 2023
Revenues by Type of Service | Integrated Upstream and Gathering |  | Pipeline and Storage |  |  |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Eliminations |  | Total Consolidated
| (Thousands)
Production of Natural Gas | $ | 1,036,499 |  |  | $ | — |  |  |  |  | $ | — |  |  | $ | 1,036,499 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,036,499 |
Production of Crude Oil | 2,261 |  |  | — |  |  |  |  | — |  |  | 2,261 |  |  | — |  |  | — |  |  | 2,261 |
Natural Gas Processing | 1,203 |  |  | — |  |  |  |  | — |  |  | 1,203 |  |  | — |  |  | — |  |  | 1,203 |
Natural Gas Gathering Service | 13,891 |  |  | — |  |  |  |  | — |  |  | 13,891 |  |  | — |  |  | — |  |  | 13,891 |
Natural Gas Transportation Service | — |  |  | 291,225 |  |  |  |  | 98,304 |  |  | 389,529 |  |  | — |  |  | (82,889) |  |  | 306,640 |
Natural Gas Storage Service | — |  |  | 84,962 |  |  |  |  | — |  |  | 84,962 |  |  | — |  |  | (36,283) |  |  | 48,679 |
Natural Gas Residential Sales | — |  |  | — |  |  |  |  | 727,728 |  |  | 727,728 |  |  | — |  |  | — |  |  | 727,728 |
Natural Gas Commercial Sales | — |  |  | — |  |  |  |  | 103,270 |  |  | 103,270 |  |  | — |  |  | — |  |  | 103,270 |
Natural Gas Industrial Sales | — |  |  | — |  |  |  |  | 5,658 |  |  | 5,658 |  |  | — |  |  | (7) |  |  | 5,651 |
Other | 6,507 |  |  | 3,004 |  |  |  |  | 508 |  |  | 10,019 |  |  | — |  |  | (947) |  |  | 9,072 |
Total Revenues from Contracts with Customers | 1,060,361 |  |  | 379,191 |  |  |  |  | 935,468 |  |  | 2,375,020 |  |  | — |  |  | (120,126) |  |  | 2,254,894 |
Alternative Revenue Programs | — |  |  | — |  |  |  |  | 6,892 |  |  | 6,892 |  |  | — |  |  | — |  |  | 6,892 |
Derivative Financial Instruments | (88,015) |  |  | — |  |  |  |  | — |  |  | (88,015) |  |  | — |  |  | — |  |  | (88,015) |
Total Revenues | $ | 972,346 |  |  | $ | 379,191 |  |  |  |  | $ | 942,360 |  |  | $ | 2,293,897 |  |  | $ | — |  |  | $ | (120,126) |  |  | $ | 2,173,771 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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