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Details of Selected Financial Statement Captions (Tables) | 12 Months Ended
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Sep. 30, 2025
Balance Sheet Related Disclosures [Abstract] |
Schedule of Accounts Receivables | Accounts receivable was comprised of the following at September 30, 2025 and 2024:
| September 30
| 2025 |  | 2024
| (In thousands)
Billed accounts receivable | $ | 213,651 |  |  | $ | 220,869 |
Unbilled revenue | 140,651 |  |  | 123,550 |
Insurance receivable | 22,940 |  |  | 51,715 |
Other accounts receivable | 43,526 |  |  | 6,804 |
Total accounts receivable | 420,768 |  |  | 402,938 |
Less: allowance for uncollectible accounts | (45,259) |  |  | (37,056) |
Net accounts receivable | $ | 375,509 |  |  | $ | 365,882 |
Schedule of Other Current Assets | Other current assets as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Deferred gas costs | $ | 140,626 |  |  | $ | 159,762 |
Winter Storm Uri incremental costs | 5,841 |  |  | 3,949 |
Prepaid expenses | 80,495 |  |  | 74,780 |
Taxes receivable | 8,948 |  |  | 14,332 |
Materials and supplies | 20,076 |  |  | 16,961 |
Assets from risk management activities | 5,303 |  |  | 2,091 |
Regulatory assets (See Note 3) | 33,311 |  |  | 12,297 |
Other | 7,027 |  |  | 3,896 |
Total | $ | 301,627 |  |  | $ | 288,068 |
Schedule of Property, Plant and Equipment | Property, plant and equipment was comprised of the following as of September 30, 2025 and 2024:
| September 30
| 2025 |  | 2024
| (In thousands)
Storage plant | $ | 790,621 |  |  | $ | 708,617 |
Transmission plant | 6,308,557 |  |  | 5,713,831 |
Distribution plant | 19,788,099 |  |  | 17,304,207 |
General plant | 1,102,931 |  |  | 1,019,018 |
Intangible plant | 38,612 |  |  | 38,612 |
| 28,028,820 |  |  | 24,784,285 |
Construction in progress | 1,235,316 |  |  | 1,063,798 |
| 29,264,136 |  |  | 25,848,083 |
Less: accumulated depreciation and amortization | (3,971,146) |  |  | (3,643,716) |
Net property, plant and equipment (1) | $ | 25,292,990 |  |  | $ | 22,204,367 |
(1) Net property, plant and equipment includes plant acquisition adjustments of $(21.1) million and $(22.9) million at September 30, 2025 and 2024.
Schedule of Deferred Charges and Other Assets | Deferred charges and other assets as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Marketable securities | $ | 114,938 |  |  | $ | 110,594 |
Regulatory assets (See Note 3) | 428,951 |  |  | 396,958 |
Operating lease right of use assets (See Note 7) | 293,934 |  |  | 249,556 |
Winter Storm Uri incremental costs | — |  |  | 6,424 |
Assets from risk management activities | 4,594 |  |  | 94,197 |
Pension and postretirement assets | 226,409 |  |  | 155,611 |
Other | 28,627 |  |  | 30,343 |
Total | $ | 1,097,453 |  |  | $ | 1,043,683 |
Schedule of Accounts Payable and Accrued Liabilities | Accounts payable and accrued liabilities as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Trade accounts payable | $ | 380,999 |  |  | $ | 341,948 |
Accrued gas payable | 37,073 |  |  | 19,125 |
Accrued liabilities | 88,444 |  |  | 84,324 |
Total | $ | 506,516 |  |  | $ | 445,397 |
Schedule of Other Current Liabilities | Other current liabilities as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Customer credit balances and deposits | $ | 56,185 |  |  | $ | 62,085 |
Accrued employee costs | 69,062 |  |  | 64,141 |
Deferred gas costs | 6,879 |  |  | 9,142 |
Operating lease liabilities (See Note 7) | 45,010 |  |  | 34,340 |
Accrued interest | 122,459 |  |  | 106,116 |
Liabilities from risk management activities | 6,339 |  |  | 7,324 |
Taxes payable | 237,965 |  |  | 215,857 |
Pension and postretirement liabilities | 6,122 |  |  | 4,622 |
Regulatory cost of removal obligation | 108,558 |  |  | 99,217 |
APT annual adjustment mechanism | 68,094 |  |  | 35,924 |
Regulatory excess deferred taxes (See Note 15) | 72,792 |  |  | 79,686 |
Other | 36,092 |  |  | 32,166 |
Total | $ | 835,557 |  |  | $ | 750,620 |
Schedule of Deferred Credits and Other Liabilities | Deferred credits and other liabilities as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Pension and postretirement liabilities | $ | 68,398 |  |  | $ | 67,322 |
Operating lease liabilities (See Note 7) | 262,549 |  |  | 224,498 |
Customer advances for construction | 9,573 |  |  | 7,973 |
Other regulatory liabilities (See Note 3) | 332,017 |  |  | 279,979 |
Asset retirement obligation | 7,428 |  |  | 7,942 |
Liabilities from risk management activities | 146 |  |  | 313 |
APT annual adjustment mechanism | 31,299 |  |  | 37,195 |
Unrecognized tax benefits (See Note 15) | 50,210 |  |  | 46,174 |
Other | 22,702 |  |  | 20,536 |
Total | $ | 784,322 |  |  | $ | 691,932 |
Schedule of Other Non-Operating Income | Other non-operating income for the fiscal years ended September 30, 2025, 2024, and 2023 were comprised of the following accounts.
| Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (In thousands)
Equity component of AFUDC | $ | 75,425 |  |  | $ | 58,234 |  |  | $ | 64,019 |
Performance-based rate program | 8,485 |  |  | 8,389 |  |  | 7,093 |
Pension and other postretirement non-service credit | 14,372 |  |  | 10,820 |  |  | 8,955 |
Interest income | 29,944 |  |  | 22,887 |  |  | 7,207 |
Community support spending | (21,114) |  |  | (20,016) |  |  | (12,027) |
Unrealized gains on equity securities | 174 |  |  | 3,562 |  |  | 1,406 |
Miscellaneous | (17,545) |  |  | (12,830) |  |  | (6,878) |
Total | $ | 89,741 |  |  | $ | 71,046 |  |  | $ | 69,775 |
Schedule of Supplemental Cash Flow Disclosures | Supplemental disclosures of cash flow information for the fiscal years ended September 30, 2025, 2024, and 2023 were as follows:
| Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (In thousands)
Cash Paid (Received) During The Period For: |  |  |  |  |
Interest (1) | $ | 349,222 |  |  | $ | 308,872 |  |  | $ | 249,066 |
Income taxes: |  |  |  |  |
Federal | $ | (5,000) |  |  | $ | 8,200 |  |  | $ | (4,500) |
State of Texas | 7,095 |  |  | 5,372 |  |  | 17,200 |
State of Louisiana | 2,357 |  |  | 1,739 |  |  | 2,232 |
Other states | — |  |  | 38 |  |  | 36 |
| $ | 4,452 |  |  | $ | 15,349 |  |  | $ | 14,968 |
Non-Cash Transactions: |  |  |  |  |
Capital expenditures included in current liabilities | $ | 327,814 |  |  | $ | 299,908 |  |  | $ | 186,912 |
(1) Cash paid during the period for interest, net of amounts capitalized was $155.3 million, $163.5 million, and $117.9 million for the fiscal years ended September 30, 2025, 2024, and 2023.

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