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Business Segment Information - Information By Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues From External Customers | [1] | $ 2,277,541 | [2] | $ 1,944,810 |  | $ 2,173,771 | [3]
Intersegment Revenues |  | 0 |  | 0 |  | 0 |
Total Revenues |  | 2,277,541 |  | 1,944,810 |  | 2,173,771 |
Operation and Maintenance Expense |  |  |  |  |  |  |
Upstream General and Administrative Expense | [4] | 75,057 |  | 70,927 |  | 65,833 |
Lease Operating Expense | [4] | 44,848 |  | 46,330 |  | 40,952 |
Gathering Operation and Maintenance Expense | [4] | 48,389 |  | 35,903 |  | 33,395 |
All Other Operation and Maintenance Expense | [4] | 389,571 |  | 366,858 |  | 338,576 |
Purchased Gas | [4] | 213,441 |  | 150,062 |  | 437,595 |
Depreciation, Depletion and Amortization | [4] | 456,594 |  | 457,026 |  | 409,573 |
Impairment of Assets (Significant Non-Cash Item) |  | 141,802 | [4] | 519,129 | [4] | 0 |
Interest Expense | [4] | 155,834 |  | 138,695 |  | 131,886 |
Interest Income |  | (6,016) |  | (8,727) |  | (11,479) |
Income Tax Expense (Benefit) | [4] | 175,549 |  | 9,742 |  | 164,533 |
Other Expense (Income) Items | [5] | 63,968 |  | 81,352 |  | 86,041 |
Segment Profit: Net Income (Loss) |  | 518,504 |  | 77,513 |  | 476,866 |
Expenditures for Additions to Long-Lived Assets |  | 918,101 |  | 942,015 |  | 1,123,573 |
Segment Assets |  | 8,719,104 |  | 8,319,770 |  | 8,280,260 |
Total Reportable Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 2,429,366 |  | 2,086,370 |  | 2,293,897 |
All Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 0 |  | 0 |  | 0 |
Corporate |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues From External Customers | [1] | 0 | [2] | 0 |  | 0 | [3]
Corporate and Intersegment Eliminations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Intersegment Revenues |  | (151,825) |  | (141,560) |  | (120,126) |
Total Revenues |  | (151,825) |  | (141,560) |  | (120,126) |
Operation and Maintenance Expense |  |  |  |  |  |  |
Upstream General and Administrative Expense | [4] | (223) |  | (221) |  | (241) |
Lease Operating Expense | [4] | (5,817) |  | (5,723) |  | (6,902) |
Gathering Operation and Maintenance Expense | [4] | (246) |  | (237) |  | (255) |
All Other Operation and Maintenance Expense | [4] | 16,688 |  | 12,835 |  | 14,035 |
Purchased Gas | [4] | (145,013) |  | (133,153) |  | (110,600) |
Depreciation, Depletion and Amortization | [4] | 596 |  | 473 |  | 429 |
Impairment of Assets (Significant Non-Cash Item) | [4] | 0 |  | 0 |  |  |
Interest Expense | [4] | (9,813) |  | (17,839) |  | (15,309) |
Interest Income |  | 3,809 |  | 8,703 |  | 5,662 |
Income Tax Expense (Benefit) | [4] | (702) |  | 145 |  | (983) |
Other Expense (Income) Items | [5] | (1,518) |  | (4,955) |  | (2,464) |
Segment Profit: Net Income (Loss) |  | (9,586) |  | (1,588) |  | (3,498) |
Expenditures for Additions to Long-Lived Assets |  | 909 |  | 970 |  | 754 |
Segment Assets |  | 61,718 |  | (145,727) |  | (109,647) |
Total Reportable Segments | Total Reportable Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues From External Customers | [1] | 2,277,541 | [2] | 1,944,810 |  | 2,173,771 | [3]
Intersegment Revenues |  | 151,825 |  | 141,560 |  | 120,126 |
Total Revenues |  | 2,429,366 |  | 2,086,370 |  | 2,293,897 |
Operation and Maintenance Expense |  |  |  |  |  |  |
Upstream General and Administrative Expense | [4] | 75,280 |  | 71,148 |  | 66,074 |
Lease Operating Expense | [4] | 50,665 |  | 52,053 |  | 47,854 |
Gathering Operation and Maintenance Expense | [4] | 48,635 |  | 36,140 |  | 33,650 |
All Other Operation and Maintenance Expense | [4] | 372,883 |  | 354,006 |  | 324,520 |
Purchased Gas | [4] | 358,454 |  | 283,215 |  | 548,195 |
Depreciation, Depletion and Amortization | [4] | 455,998 |  | 456,553 |  | 409,144 |
Impairment of Assets (Significant Non-Cash Item) | [4] | 141,802 |  | 519,129 |  |  |
Interest Expense | [4] | 165,111 |  | 156,160 |  | 147,038 |
Interest Income |  | (9,814) |  | (17,430) |  | (17,141) |
Income Tax Expense (Benefit) | [4] | 176,496 |  | 9,783 |  | 165,680 |
Other Expense (Income) Items | [5] | 64,952 |  | 85,895 |  | 87,988 |
Segment Profit: Net Income (Loss) |  | 528,904 |  | 79,718 |  | 480,895 |
Expenditures for Additions to Long-Lived Assets |  | 917,192 |  | 941,045 |  | 1,122,819 |
Segment Assets |  | 8,648,682 |  | 8,459,270 |  | 8,385,112 |
Integrated Upstream and Gathering | Total Reportable Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues From External Customers | [1] | 1,184,136 | [2] | 976,615 |  | 972,346 | [3]
Intersegment Revenues |  | 0 |  | 0 |  | 0 |
Total Revenues |  | 1,184,136 |  | 976,615 |  | 972,346 |
Operation and Maintenance Expense |  |  |  |  |  |  |
Upstream General and Administrative Expense | [4] | 75,280 |  | 71,148 |  | 66,074 |
Lease Operating Expense | [4] | 50,665 |  | 52,053 |  | 47,854 |
Gathering Operation and Maintenance Expense | [4] | 48,635 |  | 36,140 |  | 33,650 |
All Other Operation and Maintenance Expense | [4] | 16,049 |  | 15,529 |  | 9,327 |
Purchased Gas | [4] | 0 |  | 0 |  | 0 |
Depreciation, Depletion and Amortization | [4] | 311,817 |  | 316,762 |  | 276,867 |
Impairment of Assets (Significant Non-Cash Item) | [4] | 141,802 |  | 473,054 |  |  |
Interest Expense | [4] | 76,633 |  | 74,005 |  | 69,306 |
Interest Income |  | (1,445) |  | (3,062) |  | (3,793) |
Income Tax Expense (Benefit) | [4] | 121,095 |  | (20,213) |  | 123,924 |
Other Expense (Income) Items | [5] | 18,907 |  | 18,240 |  | 17,138 |
Segment Profit: Net Income (Loss) |  | 324,698 |  | (57,041) |  | 331,999 |
Expenditures for Additions to Long-Lived Assets |  | 605,433 |  | 645,600 |  | 841,020 |
Segment Assets |  | 3,701,646 |  | 3,614,318 |  | 3,710,155 |
Integrated Upstream and Gathering | Total Reportable Segments | Customer Concentration Risk | One Customer | Revenue Benchmark |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 258,000 |  |  |  | 208,000 |
Pipeline and Storage |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 276,131 |  | 271,388 |  | 259,646 |
Pipeline and Storage | Total Reportable Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues From External Customers | [1] | 276,131 | [2] | 271,388 |  | 259,646 | [3]
Intersegment Revenues |  | 151,470 |  | 141,005 |  | 119,545 |
Total Revenues |  | 427,601 |  | 412,393 |  | 379,191 |
Operation and Maintenance Expense |  |  |  |  |  |  |
Upstream General and Administrative Expense | [4] | 0 |  | 0 |  | 0 |
Lease Operating Expense | [4] | 0 |  | 0 |  | 0 |
Gathering Operation and Maintenance Expense | [4] | 0 |  | 0 |  | 0 |
All Other Operation and Maintenance Expense | [4] | 122,379 |  | 116,335 |  | 106,654 |
Purchased Gas | [4] | 0 |  | 0 |  | 0 |
Depreciation, Depletion and Amortization | [4] | 74,480 |  | 74,530 |  | 70,827 |
Impairment of Assets (Significant Non-Cash Item) | [4] | 0 |  | 46,075 |  |  |
Interest Expense | [4] | 45,509 |  | 47,428 |  | 43,499 |
Interest Income |  | (6,085) |  | (8,632) |  | (7,052) |
Income Tax Expense (Benefit) | [4] | 39,748 |  | 26,045 |  | 34,489 |
Other Expense (Income) Items | [5] | 30,613 |  | 30,942 |  | 30,273 |
Segment Profit: Net Income (Loss) |  | 120,957 |  | 79,670 |  | 100,501 |
Expenditures for Additions to Long-Lived Assets |  | 121,798 |  | 110,830 |  | 141,877 |
Segment Assets |  | 2,412,747 |  | 2,446,243 |  | 2,427,214 |
Pipeline and Storage | Total Reportable Segments | Customer Concentration Risk | One Customer | Revenue Benchmark |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total Revenues |  | 16,000 |  |  |  | 14,000 |
Utility | Total Reportable Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues From External Customers | [1] | 817,274 | [2] | 696,807 |  | 941,779 | [3]
Intersegment Revenues |  | 355 |  | 555 |  | 581 |
Total Revenues |  | 817,629 |  | 697,362 |  | 942,360 |
Operation and Maintenance Expense |  |  |  |  |  |  |
Upstream General and Administrative Expense | [4] | 0 |  | 0 |  | 0 |
Lease Operating Expense | [4] | 0 |  | 0 |  | 0 |
Gathering Operation and Maintenance Expense | [4] | 0 |  | 0 |  | 0 |
All Other Operation and Maintenance Expense | [4] | 234,455 |  | 222,142 |  | 208,539 |
Purchased Gas | [4] | 358,454 |  | 283,215 |  | 548,195 |
Depreciation, Depletion and Amortization | [4] | 69,701 |  | 65,261 |  | 61,450 |
Impairment of Assets (Significant Non-Cash Item) | [4] | 0 |  | 0 |  |  |
Interest Expense | [4] | 42,969 |  | 34,727 |  | 34,233 |
Interest Income |  | (2,284) |  | (5,736) |  | (6,296) |
Income Tax Expense (Benefit) | [4] | 15,653 |  | 3,951 |  | 7,267 |
Other Expense (Income) Items | [5] | 15,432 |  | 36,713 |  | 40,577 |
Segment Profit: Net Income (Loss) |  | 83,249 |  | 57,089 |  | 48,395 |
Expenditures for Additions to Long-Lived Assets |  | 189,961 |  | 184,615 |  | 139,922 |
Segment Assets |  | 2,534,289 |  | 2,398,709 |  | 2,247,743 |
All Other | All Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues From External Customers | [1] | 0 | [2] | 0 |  | 0 | [3]
Intersegment Revenues |  | 0 |  | 0 |  | 0 |
Total Revenues |  | 0 |  | 0 |  | 0 |
Operation and Maintenance Expense |  |  |  |  |  |  |
Upstream General and Administrative Expense | [4] | 0 |  | 0 |  | 0 |
Lease Operating Expense | [4] | 0 |  | 0 |  | 0 |
Gathering Operation and Maintenance Expense | [4] | 0 |  | 0 |  | 0 |
All Other Operation and Maintenance Expense | [4] | 0 |  | 17 |  | 21 |
Purchased Gas | [4] | 0 |  | 0 |  | 0 |
Depreciation, Depletion and Amortization | [4] | 0 |  | 0 |  | 0 |
Impairment of Assets (Significant Non-Cash Item) | [4] | 0 |  | 0 |  |  |
Interest Expense | [4] | 536 |  | 374 |  | 157 |
Interest Income |  | (11) |  | 0 |  | 0 |
Income Tax Expense (Benefit) | [4] | (245) |  | (186) |  | (164) |
Other Expense (Income) Items | [5] | 534 |  | 412 |  | 517 |
Segment Profit: Net Income (Loss) |  | (814) |  | (617) |  | (531) |
Expenditures for Additions to Long-Lived Assets |  | 0 |  | 0 |  | 0 |
Segment Assets |  | $ 8,704 |  | $ 6,227 |  | $ 4,795 |
[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.

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