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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | $ 734,758 | $ 558,699 | $ 1,248,595 | $ 1,058,750
Alternative Revenue Programs | 3,026 | 11,056 | 8,943 | 16,612
Derivative Financial Instruments | (7,834) | 60,184 | 21,894 | 79,939
Total Revenues | 729,950 | 629,939 | 1,279,432 | 1,155,301
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 | (100,304) | (97,192) | (195,934) | (184,858)
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | (100,304) | (97,192) | (195,934) | (184,858)
Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 319,792 | 204,430 | 538,924 | 438,694
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | (7,834) | 60,184 | 21,894 | 79,939
Total Revenues | 311,958 | 264,614 | 560,818 | 518,633
Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 109,573 | 108,020 | 216,186 | 202,433
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 109,573 | 108,020 | 216,186 | 202,433
Gathering | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 65,030 | 63,993 | 126,161 | 126,581
Alternative Revenue Programs | 0 | 0 | 0 | 0
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 65,030 | 63,993 | 126,161 | 126,581
Utility | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 340,667 | 279,448 | 563,258 | 475,900
Alternative Revenue Programs | 3,026 | 11,056 | 8,943 | 16,612
Derivative Financial Instruments | 0 | 0 | 0 | 0
Total Revenues | 343,693 | 290,504 | 572,201 | 492,512
Production of Natural Gas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 318,404 | 203,198 | 535,863 | 435,859
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 | 318,404 | 203,198 | 535,863 | 435,859
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 | 393 | 524 | 907 | 1,211
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 | 393 | 524 | 907 | 1,211
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 | 338 | 303 | 613 | 570
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 | 338 | 303 | 613 | 570
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 | 3,233 | 3,917 | 6,681 | 8,513
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 | (61,797) | (60,076) | (119,480) | (118,068)
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 | 65,030 | 63,993 | 126,161 | 126,581
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 | 100,199 | 93,262 | 181,143 | 173,803
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 | (27,538) | (25,852) | (54,719) | (46,214)
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 | 82,481 | 81,273 | 163,686 | 152,891
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 | 45,256 | 37,841 | 72,176 | 67,126
Natural Gas Storage Service |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 14,597 | 14,319 | 29,086 | 26,551
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 | (10,691) | (11,024) | (21,195) | (20,084)
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 | 25,288 | 25,343 | 50,281 | 46,635
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 | 257,100 | 210,392 | 413,450 | 356,938
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 | 257,100 | 210,392 | 413,450 | 356,938
Natural Gas Commercial Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 39,602 | 30,815 | 61,845 | 51,096
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 | 39,602 | 30,815 | 61,845 | 51,096
Natural Gas Industrial Sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 1,935 | 1,279 | 3,272 | 2,185
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) | (2) | (3) | (3)
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 | 1,937 | 1,281 | 3,275 | 2,188
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | (1,043) | 690 | 15,735 | 2,024
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 | (276) | (238) | (537) | (489)
Other | Exploration and Production | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 657 | 405 | 1,541 | 1,054
Other | Pipeline and Storage | Total Reportable Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues from Contracts with Customers | 1,804 | 1,404 | 2,219 | 2,907
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 | $ (3,228) | $ (881) | $ 12,512 | $ (1,448)

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