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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | $ 2,219,117 | $ 1,707,359 | $ 2,254,894
Alternative Revenue Programs | 11,467 | 20,439 | 6,892
Derivative Financial Instruments | 46,957 | 217,012 | (88,015)
Total Revenues | 2,277,541 | 1,944,810 | 2,173,771
Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 2,370,942 | 1,848,919 | 2,375,020
Alternative Revenue Programs | 11,467 | 20,439 | 6,892
Derivative Financial Instruments | 46,957 | 217,012 | (88,015)
Total Revenues | 2,429,366 | 2,086,370 | 2,293,897
All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | 0 | 0 | 0
Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | (151,825) | (141,560) | (120,126)
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | (151,825) | (141,560) | (120,126)
Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,137,179 | 759,603 | 1,060,361
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 46,957 | 217,012 | (88,015)
Total Revenues | 1,184,136 | 976,615 | 972,346
Pipeline and Storage |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 276,131 | 271,388 | 259,646
Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 427,601 | 412,393 | 379,191
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | 427,601 | 412,393 | 379,191
Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 806,162 | 676,923 | 935,468
Alternative Revenue Programs | 11,467 | 20,439 | 6,892
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | 817,629 | 697,362 | 942,360
Production of Natural Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,104,283 | 738,778 | 1,036,499
Production of Natural Gas | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,104,283 | 738,778 | 1,036,499
Production of Natural Gas | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Production of Natural Gas | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Production of Natural Gas | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,104,283 | 738,778 | 1,036,499
Production of Natural Gas | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Production of Natural Gas | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Production of Crude Oil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,837 | 2,298 | 2,261
Production of Crude Oil | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,837 | 2,298 | 2,261
Production of Crude Oil | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Production of Crude Oil | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Production of Crude Oil | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,837 | 2,298 | 2,261
Production of Crude Oil | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Production of Crude Oil | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Processing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,196 | 1,053 | 1,203
Natural Gas Processing | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,196 | 1,053 | 1,203
Natural Gas Processing | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Processing | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Processing | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,196 | 1,053 | 1,203
Natural Gas Processing | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Processing | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Gathering Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 11,813 | 15,537 | 13,891
Natural Gas Gathering Service | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 11,813 | 15,537 | 13,891
Natural Gas Gathering Service | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Gathering Service | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Gathering Service | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 11,813 | 15,537 | 13,891
Natural Gas Gathering Service | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Gathering Service | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Transportation Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 325,271 | 316,108 | 306,640
Natural Gas Transportation Service | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 433,622 | 415,766 | 389,529
Natural Gas Transportation Service | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Transportation Service | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | (108,351) | (99,658) | (82,889)
Natural Gas Transportation Service | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Transportation Service | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 324,179 | 311,900 | 291,225
Natural Gas Transportation Service | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 109,443 | 103,866 | 98,304
Natural Gas Storage Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 57,807 | 54,938 | 48,679
Natural Gas Storage Service | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 100,292 | 95,933 | 84,962
Natural Gas Storage Service | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Storage Service | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | (42,485) | (40,995) | (36,283)
Natural Gas Storage Service | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Storage Service | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 100,292 | 95,933 | 84,962
Natural Gas Storage Service | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Residential Sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 596,988 | 502,744 | 727,728
Natural Gas Residential Sales | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 596,988 | 502,744 | 727,728
Natural Gas Residential Sales | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Residential Sales | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Residential Sales | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Residential Sales | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Residential Sales | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 596,988 | 502,744 | 727,728
Natural Gas Commercial Sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 84,515 | 68,466 | 103,270
Natural Gas Commercial Sales | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 84,515 | 68,466 | 103,270
Natural Gas Commercial Sales | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Commercial Sales | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Commercial Sales | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Commercial Sales | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Commercial Sales | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 84,515 | 68,466 | 103,270
Natural Gas Industrial Sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 4,399 | 3,098 | 5,651
Natural Gas Industrial Sales | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 4,403 | 3,103 | 5,658
Natural Gas Industrial Sales | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Industrial Sales | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | (4) | (5) | (7)
Natural Gas Industrial Sales | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Industrial Sales | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Industrial Sales | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 4,403 | 3,103 | 5,658
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 31,008 | 4,339 | 9,072
Other | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 31,993 | 5,241 | 10,019
Other | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Other | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | (985) | (902) | (947)
Other | Integrated Upstream and Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 18,050 | 1,937 | 6,507
Other | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 3,130 | 4,560 | 3,004
Other | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | $ 10,813 | $ (1,256) | $ 508

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