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Segment Information (Tables) | 12 Months Ended
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Sep. 30, 2025
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | Income statement information and capital expenditures by segment are shown in the following tables.
| Year Ended September 30, 2025
| Distribution |  | Pipeline and Storage |  | Total of Reportable Segments
| (In thousands)
Operating revenues from external parties | $ | 4,422,355 |  |  | $ | 280,400 |  |  | $ | 4,702,755 |
Intersegment revenues | 3,042 |  |  | 784,900 |  |  | 787,942 |
Total operating revenues | 4,425,397 |  |  | 1,065,300 |  |  | 5,490,697 |
Operation and maintenance expense | 644,924 |  |  | 229,986 |  |  | 874,910 |
Depreciation and amortization expense (2) | 543,840 |  |  | 190,905 |  |  | 734,745 |
Interest charges (2) | 99,226 |  |  | 72,452 |  |  | 171,678 |
Income tax expense (2) | 150,961 |  |  | 128,319 |  |  | 279,280 |
Other segment items (1) | 2,239,665 |  |  | (8,335) |  |  | 2,231,330 |
Net income (2) | $ | 746,781 |  |  | $ | 451,973 |  |  | $ | 1,198,754 |
Capital expenditures (2) | $ | 2,662,703 |  |  | $ | 898,696 |  |  | $ | 3,561,399 |
Reconciliation to consolidated total operating revenues: |  |  |  |  |
Total operating revenues of reportable segments |  |  |  |  | $ | 5,490,697 |
Elimination of intersegment revenues |  |  |  |  | (787,942) |
Consolidated total operating revenues |  |  |  |  | $ | 4,702,755 |
| Year Ended September 30, 2024
| Distribution |  | Pipeline and Storage |  | Total of Reportable Segments
| (In thousands)
Operating revenues from external parties | $ | 3,912,134 |  |  | $ | 253,053 |  |  | $ | 4,165,187 |
Intersegment revenues | 3,007 |  |  | 684,976 |  |  | 687,983 |
Total operating revenues | 3,915,141 |  |  | 938,029 |  |  | 4,853,170 |
Operation and maintenance expense | 589,864 |  |  | 218,571 |  |  | 808,435 |
Depreciation and amortization expense (2) | 491,982 |  |  | 177,990 |  |  | 669,972 |
Interest charges (2) | 117,086 |  |  | 73,546 |  |  | 190,632 |
Income tax expense (2) | 96,041 |  |  | 96,840 |  |  | 192,881 |
Other segment items (1) | 1,948,755 |  |  | (400) |  |  | 1,948,355 |
Net income (2) | $ | 671,413 |  |  | $ | 371,482 |  |  | $ | 1,042,895 |
Capital expenditures (2) | $ | 2,249,280 |  |  | $ | 687,844 |  |  | $ | 2,937,124 |
Reconciliation to consolidated total operating revenues: |  |  |  |  |
Total operating revenues of reportable segments |  |  |  |  | $ | 4,853,170 |
Elimination of intersegment revenues |  |  |  |  | (687,983) |
Consolidated total operating revenues |  |  |  |  | $ | 4,165,187 |
| Year Ended September 30, 2023
| Distribution |  | Pipeline and Storage |  | Total of Reportable Segments
| (In thousands)
Operating revenues from external parties | $ | 4,096,661 |  |  | $ | 178,696 |  |  | $ | 4,275,357 |
Intersegment revenues | 3,029 |  |  | 606,478 |  |  | 609,507 |
Total operating revenues | 4,099,690 |  |  | 785,174 |  |  | 4,884,864 |
Operation and maintenance expense | 543,078 |  |  | 200,580 |  |  | 743,658 |
Depreciation and amortization expense (2) | 434,721 |  |  | 169,606 |  |  | 604,327 |
Interest charges (2) | 77,185 |  |  | 60,096 |  |  | 137,281 |
Income tax expense (2) | 60,032 |  |  | 53,747 |  |  | 113,779 |
Other segment items (1) | 2,404,277 |  |  | (4,320) |  |  | 2,399,957 |
Net income (2) | $ | 580,397 |  |  | $ | 305,465 |  |  | $ | 885,862 |
Capital expenditures (2) | $ | 1,927,125 |  |  | $ | 878,848 |  |  | $ | 2,805,973 |
Reconciliation to consolidated total operating revenues: |  |  |  |  |
Total operating revenues of reportable segments |  |  |  |  | $ | 4,884,864 |
Elimination of intersegment revenues |  |  |  |  | (609,507) |
Consolidated total operating revenues |  |  |  |  | $ | 4,275,357 |
(1)Other segment items consist of purchased gas cost, bad debt expense, taxes other than income taxes, the equity component of AFUDC, community support spending, and other segment income or expense deemed insignificant which are used to reach net income, our measurement of segment profit or loss. (2)The totals of reportable segments for these items reconcile to consolidated totals. Balance sheet information at September 30, 2025 and 2024 by segment is presented in the following tables.
| September 30, 2025
| Distribution |  | Pipeline and Storage |  | Total of Reportable Segments
| (In thousands)
Property, plant and equipment, net (1) | $ | 18,765,128 |  |  | $ | 6,527,862 |  |  | $ | 25,292,990 |
Total assets | $ | 27,296,805 |  |  | $ | 6,896,646 |  |  | $ | 34,193,451 |
Reconciliation to consolidated assets: |  |  |  |  |
Total assets of reportable segments |  |  |  |  | $ | 34,193,451 |
Elimination of intersegment assets |  |  |  |  | (5,943,929) |
Consolidated total assets |  |  |  |  | $ | 28,249,522 |
| September 30, 2024
| Distribution |  | Pipeline and Storage |  | Total of Reportable Segments
| (In thousands)
Property, plant and equipment, net (1) | $ | 16,372,659 |  |  | $ | 5,831,708 |  |  | $ | 22,204,367 |
Total assets | $ | 24,328,877 |  |  | $ | 6,181,558 |  |  | $ | 30,510,435 |
Reconciliation to consolidated assets: |  |  |  |  |
Total assets of reportable segments |  |  |  |  | $ | 30,510,435 |
Elimination of intersegment assets |  |  |  |  | (5,315,970) |
Consolidated total assets |  |  |  |  | $ | 25,194,465 |
(1)The total of reportable segments for this item reconciles to consolidated total.
Schedule of Revenue from External Customers by Products and Services | The following table summarizes our revenues from external parties, excluding intersegment revenues, by products and services for the fiscal years ended September 30.
| 2025 |  | 2024 |  | 2023
| (In thousands)
Distribution revenues: |  |  |  |  |
Gas sales revenues: |  |  |  |  |
Residential | $ | 2,916,245 |  |  | $ | 2,583,681 |  |  | $ | 2,638,689 |
Commercial | 1,154,591 |  |  | 1,016,675 |  |  | 1,112,236 |
Industrial | 122,576 |  |  | 100,596 |  |  | 151,970 |
Public authority and other | 52,606 |  |  | 52,180 |  |  | 62,476 |
Total gas sales revenues | 4,246,018 |  |  | 3,753,132 |  |  | 3,965,371 |
Transportation revenues | 149,853 |  |  | 132,608 |  |  | 119,371 |
Other gas revenues | 26,484 |  |  | 26,394 |  |  | 11,919 |
Total distribution revenues | 4,422,355 |  |  | 3,912,134 |  |  | 4,096,661 |
Pipeline and storage revenues | 280,400 |  |  | 253,053 |  |  | 178,696 |
Total operating revenues | $ | 4,702,755 |  |  | $ | 4,165,187 |  |  | $ | 4,275,357 |

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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