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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | $ 527,430 | $ 338,644 | $ 1,776,653 | $ 1,397,392
Alternative Revenue Programs | 1,885 | 3,336 | 10,200 | 19,949
Derivative Financial Instruments | 2,515 | 75,462 | 24,409 | 155,401
Total Revenues | 531,830 | 417,442 | 1,811,262 | 1,572,742
All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 0 | 0 | 0 | 0
Corporate and Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | (103,028) | (93,946) | (298,962) | (278,804)
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | (103,028) | (93,946) | (298,962) | (278,804)
Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 301,368 | 145,443 | 840,292 | 584,136
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 2,515 | 75,462 | 24,409 | 155,401
Total Revenues | 303,883 | 220,905 | 864,701 | 739,537
Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 105,579 | 105,419 | 321,765 | 307,852
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 105,579 | 105,419 | 321,765 | 307,852
Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 67,873 | 60,120 | 194,034 | 186,701
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 67,873 | 60,120 | 194,034 | 186,701
Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 155,638 | 121,608 | 719,524 | 597,507
Alternative Revenue Programs | 1,885 | 3,336 | 10,200 | 19,949
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 157,523 | 124,944 | 729,724 | 617,456
Production of Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 300,137 | 144,374 | 836,000 | 580,233
Production of Natural Gas | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 0
Production of Natural Gas | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 300,137 | 144,374 | 836,000 | 580,233
Production of Natural Gas | Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 0
Production of Natural Gas | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Production of Crude Oil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 434 | 511 | 1,341 | 1,722
Production of Crude Oil | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 0
Production of Crude Oil | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 434 | 511 | 1,341 | 1,722
Production of Crude Oil | Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 0
Production of Crude Oil | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Processing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 267 | 195 | 881 | 765
Natural Gas Processing | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Processing | Corporate and Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Processing | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 267 | 195 | 881 | 765
Natural Gas Processing | Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Processing | Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Processing | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Gathering Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 2,519 | 3,644 | 9,200 | 12,157
Natural Gas Gathering Service | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Gathering Service | Corporate and Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | (65,354) | (56,476) | (184,834) | (174,544)
Natural Gas Gathering Service | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 0
Natural Gas Gathering Service | Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 67,873 | 60,120 | 194,034 | 186,701
Natural Gas Gathering Service | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Transportation Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 75,029 | 74,504 | 256,172 | 248,309
Natural Gas Transportation Service | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Transportation Service | Corporate and Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | (26,845) | (26,826) | (81,564) | (73,040)
Natural Gas Transportation Service | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Transportation Service | Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 80,235 | 79,640 | 243,921 | 232,532
Natural Gas Transportation Service | Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Transportation Service | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 21,639 | 21,690 | 93,815 | 88,817
Natural Gas Storage Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 14,424 | 14,176 | 43,510 | 40,727
Natural Gas Storage Service | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Storage Service | Corporate and Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | (10,604) | (10,436) | (31,799) | (30,520)
Natural Gas Storage Service | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Storage Service | Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 25,028 | 24,612 | 75,309 | 71,247
Natural Gas Storage Service | Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 0
Natural Gas Residential Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 118,551 | 89,034 | 532,001 | 445,971
Natural Gas Residential Sales | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 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 | 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 | 0
Natural Gas Residential Sales | Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Residential Sales | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 118,551 | 89,034 | 532,001 | 445,971
Natural Gas Commercial Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 15,349 | 11,022 | 77,194 | 62,117
Natural Gas Commercial Sales | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 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 | 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 | 0
Natural Gas Commercial Sales | Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Commercial Sales | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 15,349 | 11,022 | 77,194 | 62,117
Natural Gas Industrial Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 731 | 479 | 4,003 | 2,663
Natural Gas Industrial Sales | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Industrial Sales | Corporate and Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | (1) | (1) | (4) | (5)
Natural Gas Industrial Sales | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 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 | 0
Natural Gas Industrial Sales | Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Natural Gas Industrial Sales | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 732 | 480 | 4,007 | 2,668
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | (11) | 705 | 16,351 | 2,728
Other | All Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Other | Corporate and Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | (224) | (207) | (761) | (695)
Other | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 530 | 363 | 2,070 | 1,416
Other | Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 316 | 1,167 | 2,535 | 4,073
Other | Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 0 | 0 | 0 | 0
Other | Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | $ (633) | $ (618) | $ 12,507 | $ (2,066)

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