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Details of Selected Financial Statement Captions (Tables)
 12 Months Ended
Sep. 30, 2024
Balance Sheet Related Disclosures [Abstract]  
Schedule of Accounts Receivables
Accounts receivable was comprised of the following at September 30, 2024 and 2023:
 September 30
 20242023
 (In thousands)
Billed accounts receivable$220,869 $198,976 
Unbilled revenue123,550 105,743 
Insurance receivable51,715 33,697 
Other accounts receivable6,804 31,078 
Total accounts receivable402,938 369,494 
Less: allowance for uncollectible accounts(37,056)(40,840)
Net accounts receivable$365,882 $328,654 
Schedule of Other Current Assets
Other current assets as of September 30, 2024 and 2023 were comprised of the following accounts.
 September 30
 20242023
 (In thousands)
Deferred gas costs$159,762 $148,297 
Winter Storm Uri incremental costs3,949 21,213 
Prepaid expenses74,780 58,029 
Taxes receivable14,332 13,918 
Materials and supplies16,961 34,297 
Assets from risk management activities2,091 4,071 
Other16,193 12,211 
Total$288,068 $292,036 
Schedule of Property, Plant and Equipment
Property, plant and equipment was comprised of the following as of September 30, 2024 and 2023:
 September 30
 20242023
 (In thousands)
Storage plant$708,617 $668,237 
Transmission plant5,713,831 4,995,579 
Distribution plant17,304,207 15,283,965 
General plant1,019,018 972,054 
Intangible plant38,612 38,612 
24,784,285 21,958,447 
Construction in progress1,063,798 939,927 
25,848,083 22,898,374 
Less: accumulated depreciation and amortization(3,643,716)(3,291,791)
Net property, plant and equipment (1)
$22,204,367 $19,606,583 
    
(1)     Net property, plant and equipment includes plant acquisition adjustments of $(22.9) million and $(24.8) million at September 30, 2024 and 2023.
Schedule of Deferred Charges and Other Assets
Deferred charges and other assets as of September 30, 2024 and 2023 were comprised of the following accounts.
 September 30
 20242023
 (In thousands)
Marketable securities$110,594 $104,602 
Regulatory assets (See Note 3)
396,958 364,741 
Operating lease right of use assets (See Note 7)
249,556 223,366 
Winter Storm Uri incremental costs6,424 10,902 
Assets from risk management activities94,197 381,593 
Pension assets155,611 92,648 
Other30,343 23,306 
Total$1,043,683 $1,201,158 
Schedule of Accounts Payable and Accrued Liabilities
Accounts payable and accrued liabilities as of September 30, 2024 and 2023 were comprised of the following accounts.
 September 30
 20242023
(In thousands)
Trade accounts payable$341,948 $218,181 
Accrued gas payable19,125 43,688 
Accrued liabilities84,324 74,214 
Total$445,397 $336,083 
Schedule of Other Current Liabilities
Other current liabilities as of September 30, 2024 and 2023 were comprised of the following accounts.
 
 September 30
 20242023
 (In thousands)
Customer credit balances and deposits$62,085 $65,266 
Accrued employee costs64,141 50,042 
Deferred gas costs9,142 23,093 
Operating lease liabilities (See Note 7)
34,340 35,820 
Accrued interest106,116 78,939 
Liabilities from risk management activities7,324 14,584 
Taxes payable215,857 195,468 
Pension and postretirement liabilities4,622 9,375 
Regulatory cost of removal obligation99,217 85,850 
APT annual adjustment mechanism35,924 34,550 
Regulatory excess deferred taxes (See Note 15)
79,686 131,301 
Other32,166 38,798 
Total$750,620 $763,086 
Schedule of Deferred Credits and Other Liabilities
Deferred credits and other liabilities as of September 30, 2024 and 2023 were comprised of the following accounts.
 September 30
 20242023
 (In thousands)
Pension and postretirement liabilities$67,322 $66,523 
Operating lease liabilities (See Note 7)
224,498 194,452 
Customer advances for construction7,973 9,158 
Other regulatory liabilities (See Note 3)
279,979 242,049 
Asset retirement obligation7,942 5,174 
Liabilities from risk management activities313 824 
APT annual adjustment mechanism37,195 15,344 
Unrecognized tax benefits (See Note 15)
46,174 46,620 
Other20,536 19,754 
Total$691,932 $599,898 
Schedule of Other Non-Operating Income
Other non-operating income for the fiscal years ended September 30, 2024, 2023, and 2022 were comprised of the following accounts.
Year Ended September 30
202420232022
(In thousands)
Equity component of AFUDC$58,234 $64,019 $45,505 
Performance-based rate program8,389 7,093 8,327 
Pension and other postretirement non-service credit10,820 8,955 8,337 
Interest income22,887 7,207 2,781 
Community support spending(20,016)(12,027)(16,357)
Unrealized gains (losses) on equity securities3,562 1,406 (7,737)
Miscellaneous(12,830)(6,878)(7,119)
Total$71,046 $69,775 $33,737 
Schedule of Supplemental Cash Flow Disclosures
Supplemental disclosures of cash flow information for the fiscal years ended September 30, 2024, 2023, and 2022 were as follows:
 Year Ended September 30
 202420232022
 (In thousands)
Cash Paid During The Period For:
Interest (1)
$308,872 $249,066 $234,297 
Income taxes$15,349 $14,968 $15,760 
Non-Cash Transactions:
Capital expenditures included in current liabilities$299,908 $186,912 $217,868 
(1)    Cash paid during the period for interest, net of amounts capitalized was $163.5 million, $117.9 million, and $98.4 million for the fiscal years ended September 30, 2024, 2023, and 2022.