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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, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | $ 1,707,359 | $ 2,254,894 | $ 3,061,283
Alternative Revenue Programs | 20,439 | 6,892 | 7,357
Derivative Financial Instruments | 217,012 | (88,015) | (882,594)
Total Revenues | 1,944,810 | 2,173,771 | 2,186,046
Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 2,077,607 | 2,591,446 | 3,375,809
Alternative Revenue Programs | 20,439 | 6,892 | 7,357
Derivative Financial Instruments | 217,012 | (88,015) | (882,594)
Total Revenues | 2,315,058 | 2,510,323 | 2,500,572
All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 6
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | 0 | 0 | 6
Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | (370,248) | (336,552) | (314,532)
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | (370,248) | (336,552) | (314,532)
Exploration and Production | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 744,066 | 1,046,470 | 1,893,058
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 217,012 | (88,015) | (882,594)
Total Revenues | 961,078 | 958,455 | 1,010,464
Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 412,393 | 379,191 | 377,044
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | 412,393 | 379,191 | 377,044
Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 244,225 | 230,317 | 214,843
Alternative Revenue Programs | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | 244,225 | 230,317 | 214,843
Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 676,923 | 935,468 | 890,864
Alternative Revenue Programs | 20,439 | 6,892 | 7,357
Derivative Financial Instruments | 0 | 0 | 0
Total Revenues | 697,362 | 942,360 | 898,221
Production of Natural Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 738,778 | 1,036,499 | 1,730,723
Production of Natural Gas | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 738,778 | 1,036,499 | 1,730,723
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 | Exploration and Production | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 738,778 | 1,036,499 | 1,730,723
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 | Gathering | 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 | 2,298 | 2,261 | 150,957
Production of Crude Oil | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 2,298 | 2,261 | 150,957
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 | Exploration and Production | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 2,298 | 2,261 | 150,957
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 | Gathering | 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 | 1,053 | 1,203 | 3,511
Natural Gas Processing | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,053 | 1,203 | 3,511
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 | Exploration and Production | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,053 | 1,203 | 3,511
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 | Gathering | 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 | 15,537 | 13,891 | 12,086
Natural Gas Gathering Service | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 244,225 | 230,317 | 214,843
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 | (228,688) | (216,426) | (202,757)
Natural Gas Gathering Service | Exploration and Production | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
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 | Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 244,225 | 230,317 | 214,843
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 | 316,108 | 306,640 | 321,713
Natural Gas Transportation Service | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 415,766 | 389,529 | 396,462
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 | (99,658) | (82,889) | (74,749)
Natural Gas Transportation Service | Exploration and Production | 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 | 311,900 | 291,225 | 289,967
Natural Gas Transportation Service | Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Natural Gas Transportation Service | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 103,866 | 98,304 | 106,495
Natural Gas Storage Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 54,938 | 48,679 | 48,183
Natural Gas Storage Service | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 95,933 | 84,962 | 84,565
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 | (40,995) | (36,283) | (36,382)
Natural Gas Storage Service | Exploration and Production | 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 | 95,933 | 84,962 | 84,565
Natural Gas Storage Service | Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
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 | 502,744 | 727,728 | 688,271
Natural Gas Residential Sales | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 502,744 | 727,728 | 688,271
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 | Exploration and Production | 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 | Gathering | 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 | 502,744 | 727,728 | 688,271
Natural Gas Commercial Sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 68,466 | 103,270 | 95,114
Natural Gas Commercial Sales | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 68,466 | 103,270 | 95,114
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 | Exploration and Production | 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 | Gathering | 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 | 68,466 | 103,270 | 95,114
Natural Gas Industrial Sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 3,098 | 5,651 | 4,902
Natural Gas Industrial Sales | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 3,103 | 5,658 | 4,902
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 | (5) | (7) | 0
Natural Gas Industrial Sales | Exploration and Production | 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 | Gathering | 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 | 3,103 | 5,658 | 4,902
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 4,339 | 9,072 | 5,823
Other | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 5,241 | 10,019 | 6,461
Other | All Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 6
Other | Corporate and Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | (902) | (947) | (644)
Other | Exploration and Production | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,937 | 6,507 | 7,867
Other | Pipeline and Storage | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 4,560 | 3,004 | 2,512
Other | Gathering | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0
Other | Utility | Total Reportable Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues from Contracts with Customers | $ (1,256) | $ 508 | $ (3,918)

X
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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