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Business Segment Information (Financial Segment Information By Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | $ 531,830 | $ 417,442 | $ 1,811,262 | $ 1,572,742 |
Intersegment Revenues | 0 | 0 | 0 | 0 |
Segment Profit: Net Income (Loss) | 149,818 | (54,158) | 411,162 | 245,134 |
Segment Assets: | 8,446,160 |  | 8,446,160 |  | $ 8,319,770
Total Reportable Segments | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 531,830 | 417,442 | 1,811,262 | 1,572,742 |
Intersegment Revenues | 103,028 | 93,946 | 298,962 | 278,804 |
Segment Profit: Net Income (Loss) | 150,521 | (53,800) | 415,264 | 244,361 |
Segment Assets: | 8,528,699 |  | 8,528,699 |  | 8,476,875
Exploration and Production | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 303,883 | 220,905 | 864,701 | 739,537 |
Intersegment Revenues | 0 | 0 | 0 | 0 |
Segment Profit: Net Income (Loss) | 86,671 | (112,028) | 137,722 | 2,521 |
Segment Assets: | 2,574,771 |  | 2,574,771 |  | 2,644,820
Pipeline and Storage | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 67,982 | 68,035 | 207,916 | 204,071 |
Intersegment Revenues | 37,597 | 37,384 | 113,849 | 103,781 |
Segment Profit: Net Income (Loss) | 28,857 | 30,690 | 93,019 | 85,482 |
Segment Assets: | 2,421,610 |  | 2,421,610 |  | 2,446,243
Gathering | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 2,519 | 3,644 | 9,200 | 12,157 |
Intersegment Revenues | 65,354 | 56,476 | 184,834 | 174,544 |
Segment Profit: Net Income (Loss) | 29,996 | 24,979 | 83,483 | 82,510 |
Segment Assets: | 1,024,345 |  | 1,024,345 |  | 987,103
Utility | Total Reportable Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue from External Customers | 157,446 | 124,858 | 729,445 | 616,977 |
Intersegment Revenues | 77 | 86 | 279 | 479 |
Segment Profit: Net Income (Loss) | 4,997 | 2,559 | 101,040 | 73,848 |
Segment Assets: | 2,507,973 |  | 2,507,973 |  | 2,398,709
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) | (209) | (124) | (674) | (341) |
Segment Assets: | 8,216 |  | 8,216 |  | 6,227
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 | (103,028) | (93,946) | (298,962) | (278,804) |
Segment Profit: Net Income (Loss) | (494) | $ (234) | (3,428) | $ 1,114 |
Segment Assets: | $ (90,755) |  | $ (90,755) |  | $ (163,332)

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