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Business Segment Information (Tables) | 12 Months Ended
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Sep. 30, 2024
Segment Reporting [Abstract] |
Schedule of Information by Segment |
| Year Ended September 30, 2024
| Exploration and Production |  | Pipeline and Storage |  | Gathering |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Eliminations |  | Total Consolidated
| (Thousands)
Revenue from External Customers(1) | $ | 961,078 |  |  | $ | 271,388 |  |  | $ | 15,537 |  |  | $ | 696,807 |  |  | $ | 1,944,810 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,944,810 |
Intersegment Revenues | $ | — |  |  | $ | 141,005 |  |  | $ | 228,688 |  |  | $ | 555 |  |  | $ | 370,248 |  |  | $ | — |  |  | $ | (370,248) |  |  | $ | — |
Interest Income | $ | 2,729 |  |  | $ | 8,632 |  |  | $ | 333 |  |  | $ | 5,736 |  |  | $ | 17,430 |  |  | $ | — |  |  | $ | (8,703) |  |  | $ | 8,727 |
Interest Expense | $ | 59,799 |  |  | $ | 47,428 |  |  | $ | 14,206 |  |  | $ | 34,727 |  |  | $ | 156,160 |  |  | $ | 374 |  |  | $ | (17,839) |  |  | $ | 138,695 |
Depreciation, Depletion and Amortization | $ | 277,945 |  |  | $ | 74,530 |  |  | $ | 38,817 |  |  | $ | 65,261 |  |  | $ | 456,553 |  |  | $ | — |  |  | $ | 473 |  |  | $ | 457,026 |
Significant Non-Cash Item: Impairment of Assets | $ | 473,054 |  |  | $ | 46,075 |  |  | $ | — |  |  | $ | — |  |  | $ | 519,129 |  |  | $ | — |  |  | $ | — |  |  | $ | 519,129 |
Income Tax Expense (Benefit) | $ | (58,430) |  |  | $ | 26,045 |  |  | $ | 38,217 |  |  | $ | 3,951 |  |  | $ | 9,783 |  |  | $ | (186) |  |  | $ | 145 |  |  | $ | 9,742 |
Segment Profit: Net Income (Loss) | $ | (163,954) |  |  | $ | 79,670 |  |  | $ | 106,913 |  |  | $ | 57,089 |  |  | $ | 79,718 |  |  | $ | (617) |  |  | $ | (1,588) |  |  | $ | 77,513 |
Expenditures for Additions to Long-Lived Assets | $ | 536,349 |  |  | $ | 110,830 |  |  | $ | 109,251 |  |  | $ | 184,615 |  |  | $ | 941,045 |  |  | $ | — |  |  | $ | 970 |  |  | $ | 942,015 |
| At September 30, 2024
| (Thousands)
Segment Assets | $ | 2,644,820 |  |  | $ | 2,446,243 |  |  | $ | 987,103 |  |  | $ | 2,398,709 |  |  | $ | 8,476,875 |  |  | $ | 6,227 |  |  | $ | (163,332) |  |  | $ | 8,319,770 |
| Year Ended September 30, 2023
| Exploration and Production |  | Pipeline and Storage |  | Gathering |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Elimination |  | Total Consolidated
| (Thousands)
Revenue from External Customers(1)(2) | $ | 958,455 |  |  | $ | 259,646 |  |  | $ | 13,891 |  |  | $ | 941,779 |  |  | $ | 2,173,771 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,173,771 |
Intersegment Revenues | $ | — |  |  | $ | 119,545 |  |  | $ | 216,426 |  |  | $ | 581 |  |  | $ | 336,552 |  |  | $ | — |  |  | $ | (336,552) |  |  | $ | — |
Interest Income | $ | 3,259 |  |  | $ | 7,052 |  |  | $ | 534 |  |  | $ | 6,296 |  |  | $ | 17,141 |  |  | $ | — |  |  | $ | (5,662) |  |  | $ | 11,479 |
Interest Expense | $ | 54,317 |  |  | $ | 43,499 |  |  | $ | 14,989 |  |  | $ | 34,233 |  |  | $ | 147,038 |  |  | $ | 157 |  |  | $ | (15,309) |  |  | $ | 131,886 |
Depreciation, Depletion and Amortization | $ | 241,142 |  |  | $ | 70,827 |  |  | $ | 35,725 |  |  | $ | 61,450 |  |  | $ | 409,144 |  |  | $ | — |  |  | $ | 429 |  |  | $ | 409,573 |
Income Tax Expense (Benefit) | $ | 87,796 |  |  | $ | 34,489 |  |  | $ | 36,128 |  |  | $ | 7,267 |  |  | $ | 165,680 |  |  | $ | (164) |  |  | $ | (983) |  |  | $ | 164,533 |
Segment Profit: Net Income (Loss) | $ | 232,275 |  |  | $ | 100,501 |  |  | $ | 99,724 |  |  | $ | 48,395 |  |  | $ | 480,895 |  |  | $ | (531) |  |  | $ | (3,498) |  |  | $ | 476,866 |
Expenditures for Additions to Long-Lived Assets | $ | 737,725 |  |  | $ | 141,877 |  |  | $ | 103,295 |  |  | $ | 139,922 |  |  | $ | 1,122,819 |  |  | $ | — |  |  | $ | 754 |  |  | $ | 1,123,573 |
| At September 30, 2023
| (Thousands)
Segment Assets | $ | 2,814,218 |  |  | $ | 2,427,214 |  |  | $ | 912,923 |  |  | $ | 2,247,743 |  |  | $ | 8,402,098 |  |  | $ | 4,795 |  |  | $ | (126,633) |  |  | $ | 8,280,260 |
| Year Ended September 30, 2022
| Exploration and Production |  | Pipeline and Storage |  | Gathering |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Eliminations |  | Total Consolidated
| (Thousands)
Revenue from External Customers(1)(3) | $ | 1,010,464 |  |  | $ | 265,415 |  |  | $ | 12,086 |  |  | $ | 897,916 |  |  | $ | 2,185,881 |  |  | $ | — |  |  | $ | 165 |  |  | $ | 2,186,046 |
Intersegment Revenues | $ | — |  |  | $ | 111,629 |  |  | $ | 202,757 |  |  | $ | 305 |  |  | $ | 314,691 |  |  | $ | 6 |  |  | $ | (314,697) |  |  | $ | — |
Interest Income | $ | 1,929 |  |  | $ | 2,275 |  |  | $ | 198 |  |  | $ | 2,730 |  |  | $ | 7,132 |  |  | $ | 3 |  |  | $ | (1,024) |  |  | $ | 6,111 |
Interest Expense | $ | 53,401 |  |  | $ | 42,492 |  |  | $ | 16,488 |  |  | $ | 24,115 |  |  | $ | 136,496 |  |  | $ | 4 |  |  | $ | (6,143) |  |  | $ | 130,357 |
Depreciation, Depletion and Amortization | $ | 208,148 |  |  | $ | 67,701 |  |  | $ | 33,998 |  |  | $ | 59,760 |  |  | $ | 369,607 |  |  | $ | — |  |  | $ | 183 |  |  | $ | 369,790 |
Income Tax Expense (Benefit) | $ | 43,898 |  |  | $ | 35,043 |  |  | $ | 24,949 |  |  | $ | 17,165 |  |  | $ | 121,055 |  |  | $ | 3 |  |  | $ | (4,429) |  |  | $ | 116,629 |
Significant Item: Gain on Sale of Assets | $ | 12,736 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 12,736 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,736 |
Segment Profit: Net Income (Loss) | $ | 306,064 |  |  | $ | 102,557 |  |  | $ | 101,111 |  |  | $ | 68,948 |  |  | $ | 578,680 |  |  | $ | (9) |  |  | $ | (12,650) |  |  | $ | 566,021 |
Expenditures for Additions to Long-Lived Assets | $ | 565,791 |  |  | $ | 95,806 |  |  | $ | 55,546 |  |  | $ | 111,033 |  |  | $ | 828,176 |  |  | $ | — |  |  | $ | 1,212 |  |  | $ | 829,388 |
| At September 30, 2022
| (Thousands)
Segment Assets | $ | 2,507,541 |  |  | $ | 2,394,697 |  |  | $ | 878,796 |  |  | $ | 2,299,473 |  |  | $ | 8,080,507 |  |  | $ | 2,036 |  |  | $ | (186,281) |  |  | $ | 7,896,262 |
(1)All Revenue from External Customers originated in the United States. (2)Revenue from one customer of the Company’s Exploration and Production segment, exclusive of hedging losses transacted with separate parties, represented approximately $208 million of the Company’s consolidated revenue for the year ended September 30, 2023. This one customer was also a customer of the Company’s Pipeline and Storage segment, accounting for an additional $14 million of the Company’s consolidated revenue for the year ended September 30, 2023. (3)Revenues from three customers of the Company’s Exploration and Production segment, exclusive of hedging losses transacted with separate parties, represented approximately $850 million of the Company’s consolidated revenue for the year ended September 30, 2022. These three customers were also customers of the Company’s Pipeline and Storage segment, accounting for an additional $15 million of the Company’s consolidated revenue for the year ended September 30, 2022.
Schedule of Long-Lived Assets by Geographical Areas |
Geographic Information | At September 30
| 2024 |  | 2023 |  | 2022
| (Thousands)
Long-Lived Assets: |  |  |  |  |
United States | $ | 7,963,851 |  |  | $ | 7,865,832 |  |  | $ | 7,135,131 |

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