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v3.25.1

Segment Information - Schedule of Income Statements and Capital Expenditures By Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | $ 1,950,502 |  | $ 1,647,227 |  | $ 3,126,501 | $ 2,805,694
Purchased gas cost | 779,233 |  | 624,295 |  | 1,013,281 | 963,164
Operation and maintenance expense | 233,296 |  | 199,899 |  | 440,340 | 366,244
Depreciation and amortization expense | 182,750 |  | 165,087 |  | 363,283 | 329,695
Taxes, other than income | 126,284 |  | 106,956 |  | 221,178 | 196,496
Operating income | 628,939 |  | 550,990 |  | 1,088,419 | 950,095
Other non-operating income (expense) | 24,172 |  | 16,687 |  | 48,806 | 34,573
Interest charges | 50,014 |  | 55,442 |  | 102,939 | 107,317
Income before income taxes | 603,097 |  | 512,235 |  | 1,034,286 | 877,351
Income tax expense | 117,521 |  | 80,212 |  | 196,852 | 134,036
Net income | 485,576 | $ 351,858 | 432,023 | $ 311,292 | 837,434 | 743,315
Capital expenditures | 839,666 |  | 645,876 |  | 1,730,857 | 1,415,526
Distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 1,881,742 |  | 1,588,394 |  | 2,990,311 | 2,693,013
Pipeline and Storage |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 68,760 |  | 58,833 |  | 136,190 | 112,681
Operating Segments | Distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 1,882,528 |  | 1,589,181 |  | 2,991,863 | 2,694,519
Purchased gas cost | 969,037 |  | 788,643 |  | 1,391,607 | 1,285,305
Operation and maintenance expense | 181,887 |  | 154,956 |  | 336,401 | 282,571
Depreciation and amortization expense | 134,546 |  | 121,384 |  | 268,173 | 241,069
Taxes, other than income | 113,340 |  | 98,008 |  | 195,916 | 178,903
Operating income | 483,718 |  | 426,190 |  | 799,766 | 706,671
Other non-operating income (expense) | 13,444 |  | 9,359 |  | 23,528 | 15,198
Interest charges | 30,087 |  | 36,784 |  | 64,336 | 71,365
Income before income taxes | 467,075 |  | 398,765 |  | 758,958 | 650,504
Income tax expense | 86,432 |  | 56,073 |  | 138,102 | 86,375
Net income | 380,643 |  | 342,692 |  | 620,856 | 564,129
Capital expenditures | 594,853 |  | 532,997 |  | 1,220,502 | 1,072,155
Operating Segments | Pipeline and Storage |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 258,999 |  | 223,487 |  | 514,389 | 434,656
Purchased gas cost | 968 |  | 840 |  | 910 | 844
Operation and maintenance expense | 51,662 |  | 45,196 |  | 104,454 | 84,169
Depreciation and amortization expense | 48,204 |  | 43,703 |  | 95,110 | 88,626
Taxes, other than income | 12,944 |  | 8,948 |  | 25,262 | 17,593
Operating income | 145,221 |  | 124,800 |  | 288,653 | 243,424
Other non-operating income (expense) | 10,728 |  | 7,328 |  | 25,278 | 19,375
Interest charges | 19,927 |  | 18,658 |  | 38,603 | 35,952
Income before income taxes | 136,022 |  | 113,470 |  | 275,328 | 226,847
Income tax expense | 31,089 |  | 24,139 |  | 58,750 | 47,661
Net income | 104,933 |  | 89,331 |  | 216,578 | 179,186
Capital expenditures | 244,813 |  | 112,879 |  | 510,355 | 343,371
Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | (191,025) |  | (165,441) |  | (379,751) | (323,481)
Purchased gas cost | (190,772) |  | (165,188) |  | (379,236) | (322,985)
Operation and maintenance expense | (253) |  | (253) |  | (515) | (496)
Depreciation and amortization expense | 0 |  | 0 |  | 0 | 0
Taxes, other than income | 0 |  | 0 |  | 0 | 0
Operating income | 0 |  | 0 |  | 0 | 0
Other non-operating income (expense) | 0 |  | 0 |  | 0 | 0
Interest charges | 0 |  | 0 |  | 0 | 0
Income before income taxes | 0 |  | 0 |  | 0 | 0
Income tax expense | 0 |  | 0 |  | 0 | 0
Net income | 0 |  | 0 |  | 0 | 0
Capital expenditures | 0 |  | 0 |  | 0 | 0
Eliminations | Distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | (786) |  | (787) |  | (1,552) | (1,506)
Eliminations | Pipeline and Storage |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | $ (190,239) |  | $ (164,654) |  | $ (378,199) | $ (321,975)

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