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Business Segment Information (Tables) | 12 Months Ended
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Sep. 30, 2025
Segment Reporting [Abstract] |
Schedule of Information by Segment |
| Year Ended September 30, 2025
| Integrated Upstream and Gathering |  | Pipeline and Storage |  |  |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Eliminations |  | Total Consolidated
| (Thousands)
Revenue from External Customers(1)(2) | $ | 1,184,136 |  |  | $ | 276,131 |  |  |  |  | $ | 817,274 |  |  | $ | 2,277,541 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,277,541 |
Intersegment Revenues | — |  |  | 151,470 |  |  |  |  | 355 |  |  | 151,825 |  |  | — |  |  | (151,825) |  |  | — |
Total Revenues | 1,184,136 |  |  | 427,601 |  |  |  |  | 817,629 |  |  | 2,429,366 |  |  | — |  |  | (151,825) |  |  | 2,277,541 |
Operation and Maintenance Expense(4): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upstream General and Administrative Expense | 75,280 |  |  | — |  |  |  |  | — |  |  | 75,280 |  |  | — |  |  | (223) |  |  | 75,057 |
Lease Operating Expense | 50,665 |  |  | — |  |  |  |  | — |  |  | 50,665 |  |  | — |  |  | (5,817) |  |  | 44,848 |
Gathering Operation and Maintenance Expense | 48,635 |  |  | — |  |  |  |  | — |  |  | 48,635 |  |  | — |  |  | (246) |  |  | 48,389 |
All Other Operation and Maintenance Expense | 16,049 |  |  | 122,379 |  |  |  |  | 234,455 |  |  | 372,883 |  |  | — |  |  | 16,688 |  |  | 389,571 |
Purchased Gas Expense(4) | — |  |  | — |  |  |  |  | 358,454 |  |  | 358,454 |  |  | — |  |  | (145,013) |  |  | 213,441 |
Depreciation, Depletion and Amortization Expense(4) | 311,817 |  |  | 74,480 |  |  |  |  | 69,701 |  |  | 455,998 |  |  | — |  |  | 596 |  |  | 456,594 |
Impairment of Assets (Significant Non-Cash Item)(4) | 141,802 |  |  | — |  |  |  |  | — |  |  | 141,802 |  |  | — |  |  | — |  |  | 141,802 |
Interest Expense(4) | 76,633 |  |  | 45,509 |  |  |  |  | 42,969 |  |  | 165,111 |  |  | 536 |  |  | (9,813) |  |  | 155,834 |
Interest Income | (1,445) |  |  | (6,085) |  |  |  |  | (2,284) |  |  | (9,814) |  |  | (11) |  |  | 3,809 |  |  | (6,016) |
Income Tax Expense (Benefit)(4) | 121,095 |  |  | 39,748 |  |  |  |  | 15,653 |  |  | 176,496 |  |  | (245) |  |  | (702) |  |  | 175,549 |
Other Expense (Income) Items(5) | 18,907 |  |  | 30,613 |  |  |  |  | 15,432 |  |  | 64,952 |  |  | 534 |  |  | (1,518) |  |  | 63,968 |
Segment Profit: Net Income (Loss) | $ | 324,698 |  |  | $ | 120,957 |  |  |  |  | $ | 83,249 |  |  | $ | 528,904 |  |  | $ | (814) |  |  | $ | (9,586) |  |  | $ | 518,504 |
Expenditures for Additions to Long-Lived Assets | $ | 605,433 |  |  | $ | 121,798 |  |  |  |  | $ | 189,961 |  |  | $ | 917,192 |  |  | $ | — |  |  | $ | 909 |  |  | $ | 918,101 |
| At September 30, 2025
| (Thousands)
Segment Assets | $ | 3,701,646 |  |  | $ | 2,412,747 |  |  |  |  | $ | 2,534,289 |  |  | $ | 8,648,682 |  |  | $ | 8,704 |  |  | $ | 61,718 |  |  | $ | 8,719,104 |
| Year Ended September 30, 2024
| Integrated Upstream and Gathering |  | Pipeline and Storage |  |  |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Elimination |  | Total Consolidated
| (Thousands)
Revenue from External Customers(1) | $ | 976,615 |  |  | $ | 271,388 |  |  |  |  | $ | 696,807 |  |  | $ | 1,944,810 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,944,810 |
Intersegment Revenues | — |  |  | 141,005 |  |  |  |  | 555 |  |  | 141,560 |  |  | — |  |  | (141,560) |  |  | — |
Total Revenues | 976,615 |  |  | 412,393 |  |  |  |  | 697,362 |  |  | 2,086,370 |  |  | — |  |  | (141,560) |  |  | 1,944,810 |
Operation and Maintenance Expense(4): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upstream General and Administrative Expense | 71,148 |  |  | — |  |  |  |  | — |  |  | 71,148 |  |  | — |  |  | (221) |  |  | 70,927 |
Lease Operating Expense | 52,053 |  |  | — |  |  |  |  | — |  |  | 52,053 |  |  | — |  |  | (5,723) |  |  | 46,330 |
Gathering Operation and Maintenance Expense | 36,140 |  |  | — |  |  |  |  | — |  |  | 36,140 |  |  | — |  |  | (237) |  |  | 35,903 |
All Other Operation and Maintenance Expense | 15,529 |  |  | 116,335 |  |  |  |  | 222,142 |  |  | 354,006 |  |  | 17 |  |  | 12,835 |  |  | 366,858 |
Purchased Gas Expense(4) | — |  |  | — |  |  |  |  | 283,215 |  |  | 283,215 |  |  | — |  |  | (133,153) |  |  | 150,062 |
Depreciation, Depletion and Amortization Expense(4) | 316,762 |  |  | 74,530 |  |  |  |  | 65,261 |  |  | 456,553 |  |  | — |  |  | 473 |  |  | 457,026 |
Impairment of Assets (Significant Non-Cash Item)(4) | 473,054 |  |  | 46,075 |  |  |  |  | — |  |  | 519,129 |  |  | — |  |  | — |  |  | 519,129 |
Interest Expense(4) | 74,005 |  |  | 47,428 |  |  |  |  | 34,727 |  |  | 156,160 |  |  | 374 |  |  | (17,839) |  |  | 138,695 |
Interest Income | (3,062) |  |  | (8,632) |  |  |  |  | (5,736) |  |  | (17,430) |  |  | — |  |  | 8,703 |  |  | (8,727) |
Income Tax Expense (Benefit)(4) | (20,213) |  |  | 26,045 |  |  |  |  | 3,951 |  |  | 9,783 |  |  | (186) |  |  | 145 |  |  | 9,742 |
Other Expense (Income) Items(5) | 18,240 |  |  | 30,942 |  |  |  |  | 36,713 |  |  | 85,895 |  |  | 412 |  |  | (4,955) |  |  | 81,352 |
Segment Profit: Net Income (Loss) | $ | (57,041) |  |  | $ | 79,670 |  |  |  |  | $ | 57,089 |  |  | $ | 79,718 |  |  | $ | (617) |  |  | $ | (1,588) |  |  | $ | 77,513 |
Expenditures for Additions to Long-Lived Assets | $ | 645,600 |  |  | $ | 110,830 |  |  |  |  | $ | 184,615 |  |  | $ | 941,045 |  |  | $ | — |  |  | $ | 970 |  |  | $ | 942,015 |
| At September 30, 2024
| (Thousands)
Segment Assets | $ | 3,614,318 |  |  | $ | 2,446,243 |  |  |  |  | $ | 2,398,709 |  |  | $ | 8,459,270 |  |  | $ | 6,227 |  |  | $ | (145,727) |  |  | $ | 8,319,770 |
| Year Ended September 30, 2023
| Integrated Upstream and Gathering |  | Pipeline and Storage |  |  |  | Utility |  | Total Reportable Segments |  | All Other |  | Corporate and Intersegment Eliminations |  | Total Consolidated
| (Thousands)
Revenue from External Customers(1)(3) | $ | 972,346 |  |  | $ | 259,646 |  |  |  |  | $ | 941,779 |  |  | $ | 2,173,771 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,173,771 |
Intersegment Revenues | — |  |  | 119,545 |  |  |  |  | 581 |  |  | 120,126 |  |  | — |  |  | (120,126) |  |  | — |
Total Revenues | 972,346 |  |  | 379,191 |  |  |  |  | 942,360 |  |  | 2,293,897 |  |  | — |  |  | (120,126) |  |  | 2,173,771 |
Operation and Maintenance Expense(4): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upstream General and Administrative Expense | 66,074 |  |  | — |  |  |  |  | — |  |  | 66,074 |  |  | — |  |  | (241) |  |  | 65,833 |
Lease Operating Expense | 47,854 |  |  | — |  |  |  |  | — |  |  | 47,854 |  |  | — |  |  | (6,902) |  |  | 40,952 |
Gathering Operation and Maintenance Expense | 33,650 |  |  | — |  |  |  |  | — |  |  | 33,650 |  |  | — |  |  | (255) |  |  | 33,395 |
All Other Operation and Maintenance Expense | 9,327 |  |  | 106,654 |  |  |  |  | 208,539 |  |  | 324,520 |  |  | 21 |  |  | 14,035 |  |  | 338,576 |
Purchased Gas Expense(4) | — |  |  | — |  |  |  |  | 548,195 |  |  | 548,195 |  |  | — |  |  | (110,600) |  |  | 437,595 |
Depreciation, Depletion and Amortization Expense(4) | 276,867 |  |  | 70,827 |  |  |  |  | 61,450 |  |  | 409,144 |  |  | — |  |  | 429 |  |  | 409,573 |
Interest Expense(4) | 69,306 |  |  | 43,499 |  |  |  |  | 34,233 |  |  | 147,038 |  |  | 157 |  |  | (15,309) |  |  | 131,886 |
Interest Income | (3,793) |  |  | (7,052) |  |  |  |  | (6,296) |  |  | (17,141) |  |  | — |  |  | 5,662 |  |  | (11,479) |
Income Tax Expense (Benefit)(4) | 123,924 |  |  | 34,489 |  |  |  |  | 7,267 |  |  | 165,680 |  |  | (164) |  |  | (983) |  |  | 164,533 |
Other Expense (Income) Items(5) | 17,138 |  |  | 30,273 |  |  |  |  | 40,577 |  |  | 87,988 |  |  | 517 |  |  | (2,464) |  |  | 86,041 |
Segment Profit: Net Income (Loss) | $ | 331,999 |  |  | $ | 100,501 |  |  |  |  | $ | 48,395 |  |  | $ | 480,895 |  |  | $ | (531) |  |  | $ | (3,498) |  |  | $ | 476,866 |
Expenditures for Additions to Long-Lived Assets | $ | 841,020 |  |  | $ | 141,877 |  |  |  |  | $ | 139,922 |  |  | $ | 1,122,819 |  |  | $ | — |  |  | $ | 754 |  |  | $ | 1,123,573 |
| At September 30, 2023
| (Thousands)
Segment Assets | $ | 3,710,155 |  |  | $ | 2,427,214 |  |  |  |  | $ | 2,247,743 |  |  | $ | 8,385,112 |  |  | $ | 4,795 |  |  | $ | (109,647) |  |  | $ | 8,280,260 |
(1)All Revenue from External Customers originated in the United States. (2)Revenue from one customer of the Company’s Integrated Upstream and Gathering segment, exclusive of hedging losses transacted with separate parties, represented approximately $258 million of the Company’s consolidated revenue for the year ended September 30, 2025. This one customer was also a customer of the Company’s Pipeline and Storage segment, accounting for an additional $16 million of the Company’s consolidated revenue for the year ended September 30, 2025. (3)Revenue from one customer of the Company’s Integrated Upstream and Gathering 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. (4)The Company considers this line to be a significant expense. (5)Consists of Property, Franchise and Other Taxes, Non-Service Pension and Post-Retirement Benefits Costs (Credits), Other (Income) Deductions, and Purchased Gas Expense for the Pipeline and Storage segment.
Schedule of Long-Lived Assets by Geographical Areas |
Geographic Information | At September 30
| 2025 |  | 2024 |  | 2023
| (Thousands)
Long-Lived Assets: |  |  |  |  |
United States | $ | 8,308,377 |  |  | $ | 7,963,851 |  |  | $ | 7,865,832 |

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