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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | $ 558,699 | $ 733,228 | $ 1,058,750 | $ 1,548,126
Alternative Revenue Programs | 11,056 | 2,801 | 16,612 | 5,923
Derivative Financial Instruments | 60,184 | (18,768) | 79,939 | (177,930)
Total Revenues | 629,939 | 717,261 | 1,155,301 | 1,376,119
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 | (97,192) | (86,491) | (184,858) | (170,355)
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | (97,192) | (86,491) | (184,858) | (170,355)
Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 204,430 | 263,320 | 438,694 | 699,455
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 60,184 | (18,768) | 79,939 | (177,930)
Total Revenues | 264,614 | 244,552 | 518,633 | 521,525
Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 108,020 | 95,103 | 202,433 | 192,759
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 108,020 | 95,103 | 202,433 | 192,759
Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 63,993 | 56,981 | 126,581 | 113,394
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 63,993 | 56,981 | 126,581 | 113,394
Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 279,448 | 404,315 | 475,900 | 712,873
Alternative Revenue Programs | 11,056 | 2,801 | 16,612 | 5,923
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 290,504 | 407,116 | 492,512 | 718,796
Production of Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 203,198 | 259,770 | 435,859 | 692,129
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 | 203,198 | 259,770 | 435,859 | 692,129
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 | 524 | 526 | 1,211 | 1,154
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 | 524 | 526 | 1,211 | 1,154
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 | 303 | 209 | 570 | 583
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 | 303 | 209 | 570 | 583
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 | 3,917 | 1,728 | 8,513 | 4,374
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 | (60,076) | (55,253) | (118,068) | (109,020)
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 | 63,993 | 56,981 | 126,581 | 113,394
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 | 93,262 | 87,839 | 173,803 | 171,602
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 | (25,852) | (21,751) | (46,214) | (42,568)
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 | 81,273 | 73,794 | 152,891 | 149,996
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 | 37,841 | 35,796 | 67,126 | 64,174
Natural Gas Storage Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 14,319 | 12,251 | 26,551 | 24,541
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 | (11,024) | (9,219) | (20,084) | (18,215)
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 | 25,343 | 21,470 | 46,635 | 42,756
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 | 210,392 | 318,649 | 356,938 | 562,955
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 | 210,392 | 318,649 | 356,938 | 562,955
Natural Gas Commercial Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 30,815 | 48,966 | 51,096 | 83,461
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 | 30,815 | 48,966 | 51,096 | 83,461
Natural Gas Industrial Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 1,279 | 2,764 | 2,185 | 4,403
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 | (2) | (4) | (3) | (4)
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 | 1,281 | 2,768 | 2,188 | 4,407
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 690 | 526 | 2,024 | 2,924
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 | (238) | (264) | (489) | (548)
Other | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 405 | 2,815 | 1,054 | 5,589
Other | Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 1,404 | (161) | 2,907 | 7
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 | $ (881) | $ (1,864) | $ (1,448) | $ (2,124)

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