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Details of Selected Financial Statement Captions (Tables)
 12 Months Ended
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
 20252024
 (In thousands)
Billed accounts receivable$213,651 $220,869 
Unbilled revenue140,651 123,550 
Insurance receivable22,940 51,715 
Other accounts receivable43,526 6,804 
Total accounts receivable420,768 402,938 
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
 20252024
 (In thousands)
Deferred gas costs$140,626 $159,762 
Winter Storm Uri incremental costs5,841 3,949 
Prepaid expenses80,495 74,780 
Taxes receivable8,948 14,332 
Materials and supplies20,076 16,961 
Assets from risk management activities5,303 2,091 
Regulatory assets (See Note 3)
33,311 12,297 
Other7,027 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
 20252024
 (In thousands)
Storage plant$790,621 $708,617 
Transmission plant6,308,557 5,713,831 
Distribution plant19,788,099 17,304,207 
General plant1,102,931 1,019,018 
Intangible plant38,612 38,612 
28,028,820 24,784,285 
Construction in progress1,235,316 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
 20252024
 (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 activities4,594 94,197 
Pension and postretirement assets226,409 155,611 
Other28,627 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
 20252024
(In thousands)
Trade accounts payable$380,999 $341,948 
Accrued gas payable37,073 19,125 
Accrued liabilities88,444 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
 20252024
 (In thousands)
Customer credit balances and deposits$56,185 $62,085 
Accrued employee costs69,062 64,141 
Deferred gas costs6,879 9,142 
Operating lease liabilities (See Note 7)
45,010 34,340 
Accrued interest122,459 106,116 
Liabilities from risk management activities6,339 7,324 
Taxes payable237,965 215,857 
Pension and postretirement liabilities6,122 4,622 
Regulatory cost of removal obligation108,558 99,217 
APT annual adjustment mechanism68,094 35,924 
Regulatory excess deferred taxes (See Note 15)
72,792 79,686 
Other36,092 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
 20252024
 (In thousands)
Pension and postretirement liabilities$68,398 $67,322 
Operating lease liabilities (See Note 7)
262,549 224,498 
Customer advances for construction9,573 7,973 
Other regulatory liabilities (See Note 3)
332,017 279,979 
Asset retirement obligation7,428 7,942 
Liabilities from risk management activities146 313 
APT annual adjustment mechanism31,299 37,195 
Unrecognized tax benefits (See Note 15)
50,210 46,174 
Other22,702 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
202520242023
(In thousands)
Equity component of AFUDC$75,425 $58,234 $64,019 
Performance-based rate program8,485 8,389 7,093 
Pension and other postretirement non-service credit14,372 10,820 8,955 
Interest income29,944 22,887 7,207 
Community support spending(21,114)(20,016)(12,027)
Unrealized gains on equity securities174 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
 202520242023
 (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 Texas7,095 5,372 17,200 
State of Louisiana2,357 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.