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Business Segment Information (Financial Segment Information By Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | $ 629,939 | $ 717,261 | $ 1,155,301 |  |
Intersegment Revenues | 0 | 0 | 0 |  |
Segment Profit: Net Income (Loss) | 166,272 | 140,880 | 299,292 | $ 310,570 |
Segment Assets: | 8,677,025 |  | 8,677,025 |  | $ 8,280,260
Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers |  |  |  | 1,376,119 |
Corporate and Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Intersegment Revenues |  |  |  | 0 |
Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment Profit: Net Income (Loss) |  |  | 298,160 | 310,118 |
Total Reportable Segments | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 629,939 | 717,261 | 1,155,301 | 1,376,119 |
Intersegment Revenues | 97,192 | 86,491 |  | 170,355 |
Segment Profit: Net Income (Loss) | 166,247 | 140,894 |  |  |
Segment Assets: | 8,853,383 |  | 8,853,383 |  | 8,402,098
Total Reportable Segments | Corporate and Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Intersegment Revenues |  |  | 184,858 |  |
Exploration and Production |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment Profit: Net Income (Loss) |  |  | 114,548 | 152,174 |
Exploration and Production | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 264,614 | 244,552 | 518,633 | 521,525 |
Intersegment Revenues | 0 | 0 |  | 0 |
Segment Profit: Net Income (Loss) | 62,065 | 60,982 |  |  |
Segment Assets: | 3,049,670 |  | 3,049,670 |  | 2,814,218
Exploration and Production | Corporate and Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Intersegment Revenues |  |  | 0 |  |
Pipeline and Storage |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment Profit: Net Income (Loss) |  |  | 54,792 | 53,335 |
Pipeline and Storage | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 71,210 | 64,223 | 136,036 | 131,844 |
Intersegment Revenues | 36,810 | 30,880 |  | 60,915 |
Segment Profit: Net Income (Loss) | 30,737 | 23,858 |  |  |
Segment Assets: | 2,472,011 |  | 2,472,011 |  | 2,427,214
Pipeline and Storage | Corporate and Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Intersegment Revenues |  |  | 66,397 |  |
Gathering |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment Profit: Net Income (Loss) |  |  | 57,531 | 49,072 |
Gathering | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 3,917 | 1,728 | 8,513 | 4,374 |
Intersegment Revenues | 60,076 | 55,253 |  | 109,020 |
Segment Profit: Net Income (Loss) | 28,706 | 24,334 |  |  |
Segment Assets: | 971,741 |  | 971,741 |  | 912,923
Gathering | Corporate and Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Intersegment Revenues |  |  | 118,068 |  |
Utility |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment Profit: Net Income (Loss) |  |  | 71,289 | 55,537 |
Utility | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 290,198 | 406,758 | 492,119 | 718,376 |
Intersegment Revenues | 306 | 358 |  | 420 |
Segment Profit: Net Income (Loss) | 44,739 | 31,720 |  |  |
Segment Assets: | 2,359,961 |  | 2,359,961 |  | 2,247,743
Utility | Corporate and Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Intersegment Revenues |  |  | 393 |  |
All Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment Profit: Net Income (Loss) |  |  |  | (350) |
All Other | All Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 0 | 0 | 0 | 0 |
Intersegment Revenues | 0 | 0 | 0 | 0 |
Segment Profit: Net Income (Loss) | (96) | (69) | (217) |  |
Segment Assets: | 4,823 |  | 4,823 |  | 4,795
Corporate and Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment Profit: Net Income (Loss) |  |  |  | 802 |
Corporate and Intersegment Eliminations | Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 0 | 0 | 0 | 0 |
Corporate and Intersegment Eliminations | Corporate and Intersegment Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Intersegment Revenues | (97,192) | (86,491) | (184,858) | $ (170,355) |
Segment Profit: Net Income (Loss) | 121 | $ 55 | 1,349 |  |
Segment Assets: | $ (181,181) |  | $ (181,181) |  | $ (126,633)

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