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Business Segment Information - Information By Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues From External Customers | [1] | $ 1,944,810 | [2] | $ 2,173,771 | [3] | $ 2,186,046
Intersegment Revenues |  | 0 |  | 0 |  | 0
Interest Income |  | 8,727 |  | 11,479 |  | 6,111
Interest Expense |  | 138,695 |  | 131,886 |  | 130,357
Depreciation, Depletion and Amortization |  | 457,026 |  | 409,573 |  | 369,790
Significant Non-Cash Item: Impairment of Assets |  | 519,129 |  | 0 |  | 0
Income Tax Expense (Benefit) |  | 9,742 |  | 164,533 |  | 116,629
Significant Item: Gain on Sale of Assets |  | 0 |  | 0 |  | 12,736
Segment Profit: Net Income (Loss) |  | 77,513 |  | 476,866 |  | 566,021
Expenditures for Additions to Long-Lived Assets |  | 942,015 |  | 1,123,573 |  | 829,388
Segment Assets |  | 8,319,770 |  | 8,280,260 |  | 7,896,262
Operating Revenues |  | 1,944,810 |  | 2,173,771 |  | 2,186,046
Total Reportable Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues |  | 2,315,058 |  | 2,510,323 |  | 2,500,572
All Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues |  | 0 |  | 0 |  | 6
Corporate |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues From External Customers | [1] | 0 | [2] | 0 | [3] | 165
Corporate and Intersegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Intersegment Revenues |  | (370,248) |  | (336,552) |  | (314,697)
Interest Income |  | (8,703) |  | (5,662) |  | (1,024)
Interest Expense |  | (17,839) |  | (15,309) |  | (6,143)
Depreciation, Depletion and Amortization |  | 473 |  | 429 |  | 183
Significant Non-Cash Item: Impairment of Assets |  | 0 |  |  |  |
Income Tax Expense (Benefit) |  | 145 |  | (983) |  | (4,429)
Significant Item: Gain on Sale of Assets |  |  |  |  |  | 0
Segment Profit: Net Income (Loss) |  | (1,588) |  | (3,498) |  | (12,650)
Expenditures for Additions to Long-Lived Assets |  | 970 |  | 754 |  | 1,212
Segment Assets |  | (163,332) |  | (126,633) |  | (186,281)
Operating Revenues |  | (370,248) |  | (336,552) |  | (314,532)
Total Reportable Segments | Total Reportable Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues From External Customers | [1] | 1,944,810 | [2] | 2,173,771 | [3] | 2,185,881
Intersegment Revenues |  | 370,248 |  | 336,552 |  | 314,691
Interest Income |  | 17,430 |  | 17,141 |  | 7,132
Interest Expense |  | 156,160 |  | 147,038 |  | 136,496
Depreciation, Depletion and Amortization |  | 456,553 |  | 409,144 |  | 369,607
Significant Non-Cash Item: Impairment of Assets |  | 519,129 |  |  |  |
Income Tax Expense (Benefit) |  | 9,783 |  | 165,680 |  | 121,055
Significant Item: Gain on Sale of Assets |  |  |  |  |  | 12,736
Segment Profit: Net Income (Loss) |  | 79,718 |  | 480,895 |  | 578,680
Expenditures for Additions to Long-Lived Assets |  | 941,045 |  | 1,122,819 |  | 828,176
Segment Assets |  | 8,476,875 |  | 8,402,098 |  | 8,080,507
Exploration and Production |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Significant Non-Cash Item: Impairment of Assets |  | 473,054 |  |  |  |
Exploration and Production | Total Reportable Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues From External Customers | [1] | 961,078 | [2] | 958,455 | [3] | 1,010,464
Intersegment Revenues |  | 0 |  | 0 |  | 0
Interest Income |  | 2,729 |  | 3,259 |  | 1,929
Interest Expense |  | 59,799 |  | 54,317 |  | 53,401
Depreciation, Depletion and Amortization |  | 277,945 |  | 241,142 |  | 208,148
Income Tax Expense (Benefit) |  | (58,430) |  | 87,796 |  | 43,898
Significant Item: Gain on Sale of Assets |  |  |  |  |  | 12,736
Segment Profit: Net Income (Loss) |  | (163,954) |  | 232,275 |  | 306,064
Expenditures for Additions to Long-Lived Assets |  | 536,349 |  | 737,725 |  | 565,791
Segment Assets |  | 2,644,820 |  | 2,814,218 |  | 2,507,541
Operating Revenues |  | 961,078 |  | 958,455 |  | 1,010,464
Exploration and Production | Total Reportable Segments | Customer Concentration Risk | Three Customers | Revenue Benchmark |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues |  |  |  |  |  | 850,000
Exploration and Production | Total Reportable Segments | Customer Concentration Risk | One Customer | Revenue Benchmark |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues |  |  |  | 208,000 |  |
Pipeline and Storage | Total Reportable Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues From External Customers | [1] | 271,388 | [2] | 259,646 | [3] | 265,415
Intersegment Revenues |  | 141,005 |  | 119,545 |  | 111,629
Interest Income |  | 8,632 |  | 7,052 |  | 2,275
Interest Expense |  | 47,428 |  | 43,499 |  | 42,492
Depreciation, Depletion and Amortization |  | 74,530 |  | 70,827 |  | 67,701
Significant Non-Cash Item: Impairment of Assets |  | 46,075 |  |  |  |
Income Tax Expense (Benefit) |  | 26,045 |  | 34,489 |  | 35,043
Significant Item: Gain on Sale of Assets |  |  |  |  |  | 0
Segment Profit: Net Income (Loss) |  | 79,670 |  | 100,501 |  | 102,557
Expenditures for Additions to Long-Lived Assets |  | 110,830 |  | 141,877 |  | 95,806
Segment Assets |  | 2,446,243 |  | 2,427,214 |  | 2,394,697
Operating Revenues |  | 412,393 |  | 379,191 |  | 377,044
Pipeline and Storage | Total Reportable Segments | Customer Concentration Risk | Three Customers | Revenue Benchmark |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues |  |  |  |  |  | 15,000
Pipeline and Storage | Total Reportable Segments | Customer Concentration Risk | One Customer | Revenue Benchmark |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues |  |  |  | 14,000 |  |
Gathering | Total Reportable Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues From External Customers | [1] | 15,537 | [2] | 13,891 | [3] | 12,086
Intersegment Revenues |  | 228,688 |  | 216,426 |  | 202,757
Interest Income |  | 333 |  | 534 |  | 198
Interest Expense |  | 14,206 |  | 14,989 |  | 16,488
Depreciation, Depletion and Amortization |  | 38,817 |  | 35,725 |  | 33,998
Significant Non-Cash Item: Impairment of Assets |  | 0 |  |  |  |
Income Tax Expense (Benefit) |  | 38,217 |  | 36,128 |  | 24,949
Significant Item: Gain on Sale of Assets |  |  |  |  |  | 0
Segment Profit: Net Income (Loss) |  | 106,913 |  | 99,724 |  | 101,111
Expenditures for Additions to Long-Lived Assets |  | 109,251 |  | 103,295 |  | 55,546
Segment Assets |  | 987,103 |  | 912,923 |  | 878,796
Operating Revenues |  | 244,225 |  | 230,317 |  | 214,843
Utility | Total Reportable Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues From External Customers | [1] | 696,807 | [2] | 941,779 | [3] | 897,916
Intersegment Revenues |  | 555 |  | 581 |  | 305
Interest Income |  | 5,736 |  | 6,296 |  | 2,730
Interest Expense |  | 34,727 |  | 34,233 |  | 24,115
Depreciation, Depletion and Amortization |  | 65,261 |  | 61,450 |  | 59,760
Significant Non-Cash Item: Impairment of Assets |  | 0 |  |  |  |
Income Tax Expense (Benefit) |  | 3,951 |  | 7,267 |  | 17,165
Significant Item: Gain on Sale of Assets |  |  |  |  |  | 0
Segment Profit: Net Income (Loss) |  | 57,089 |  | 48,395 |  | 68,948
Expenditures for Additions to Long-Lived Assets |  | 184,615 |  | 139,922 |  | 111,033
Segment Assets |  | 2,398,709 |  | 2,247,743 |  | 2,299,473
Operating Revenues |  | 697,362 |  | 942,360 |  | 898,221
All Other | All Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues From External Customers | [1] | 0 | [2] | 0 | [3] | 0
Intersegment Revenues |  | 0 |  | 0 |  | 6
Interest Income |  | 0 |  | 0 |  | 3
Interest Expense |  | 374 |  | 157 |  | 4
Depreciation, Depletion and Amortization |  | 0 |  | 0 |  | 0
Significant Non-Cash Item: Impairment of Assets |  | 0 |  |  |  |
Income Tax Expense (Benefit) |  | (186) |  | (164) |  | 3
Significant Item: Gain on Sale of Assets |  |  |  |  |  | 0
Segment Profit: Net Income (Loss) |  | (617) |  | (531) |  | (9)
Expenditures for Additions to Long-Lived Assets |  | 0 |  | 0 |  | 0
Segment Assets |  | $ 6,227 |  | $ 4,795 |  | $ 2,036
[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.

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