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Details of Selected Consolidated Balance Sheet Captions (Table)
 12 Months Ended
Sep. 30, 2021
Balance Sheet Related Disclosures [Abstract]  
Accounts Receivables Detail Table
Accounts receivable was comprised of the following at September 30, 2021 and 2020:
 September 30
 20212020
 (In thousands)
Billed accounts receivable$218,219 $140,259 
Unbilled revenue97,417 80,699 
Contributions in aid of construction receivable18,984 19,821 
Insurance receivable53,779 4,731 
Other accounts receivable19,039 15,034 
Total accounts receivable407,438 260,544 
Less: allowance for uncollectible accounts(64,471)(29,949)
Net accounts receivable$342,967 $230,595 
Other Current Assets Detail Table
Other current assets as of September 30, 2021 and 2020 were comprised of the following accounts.
 September 30
 20212020
 (In thousands)
Deferred gas costs$66,395 $40,593 
Winter Storm Uri incremental costs (1)
2,011,719 — 
Prepaid expenses48,766 40,340 
Materials and supplies15,581 6,829 
Assets from risk management activities55,073 5,687 
Other3,375 14,456 
Total$2,200,909 $107,905 
(1)    Includes $2,003.7 million of gas purchases and $8.0 million of carrying costs that were deferred pursuant to regulatory orders. See Note 9 to the consolidated financial statements for additional details.
Property, Plant and Equipment Detail Table
Property, plant and equipment was comprised of the following as of September 30, 2021 and 2020:
 September 30
 20212020
 (In thousands)
Storage plant$539,972 $530,985 
Transmission plant3,725,347 3,459,765 
Distribution plant12,085,654 10,680,495 
General plant868,962 829,624 
Intangible plant38,612 38,297 
17,258,547 15,539,166 
Construction in progress626,551 418,055 
17,885,098 15,957,221 
Less: accumulated depreciation and amortization(2,821,128)(2,601,874)
Net property, plant and equipment (1)
$15,063,970 $13,355,347 
    
(1)     Net property, plant and equipment includes plant acquisition adjustments of $(28.5) million and $(37.8) million at September 30, 2021 and 2020.
Deferred Charges and Other Assets Detail Table
Deferred charges and other assets as of September 30, 2021 and 2020 were comprised of the following accounts.
 September 30
 20212020
 (In thousands)
Marketable securities$108,071 $103,952 
Regulatory assets (See Note 2)351,843 371,707 
Operating lease right of use assets (See Note 6)222,446 227,146 
Winter Storm Uri incremental costs (1)
89,009 — 
Assets from risk management activities175,613 74,991 
Other27,738 23,374 
Total$974,720 $801,170 
(1)    Includes $76.7 million of gas purchases and $12.3 million of carrying costs that were deferred pursuant to regulatory orders. See Note 9 to the consolidated financial statements for additional details.
Accounts Payable and Accrued Liabilities
Accounts payable and accrued liabilities as of September 30, 2021 and 2020 were comprised of the following accounts.
 September 30
 20212020
(In thousands)
Trade accounts payable$224,873 $141,075 
Accrued gas payable100,699 42,054 
Accrued liabilities97,650 52,646 
Total$423,222 $235,775 
Other Current Liabilities Detail Table
Other current liabilities as of September 30, 2021 and 2020 were comprised of the following accounts.
 
 September 30
 20212020
 (In thousands)
Customer credit balances and deposits$49,722 $56,485 
Accrued employee costs50,517 48,057 
Deferred gas costs52,553 19,985 
Operating lease liabilities (See Note 6)37,688 35,716 
Accrued interest55,164 53,554 
Liabilities from risk management activities5,269 2,015 
Taxes payable160,986 148,292 
Pension and postretirement liabilities4,863 29,609 
Regulatory cost of removal obligation72,823 73,908 
APT annual adjustment mechanism22,694 43,893 
Regulatory excess deferred taxes (See Note 14)155,857 20,887 
Other18,545 14,060 
Total$686,681 $546,461 
Deferred Credits and Other Liabilities Detail Table
Deferred credits and other liabilities as of September 30, 2021 and 2020 were comprised of the following accounts.
 September 30
 20212020
 (In thousands)
Pension and post retirement liabilities$185,617 $337,303 
Operating lease liabilities (See Note 6)194,745 201,071 
Customer advances for construction9,879 10,060 
Other regulatory liabilities (See Note 2)75,506 17,838 
Asset retirement obligation18,373 20,348 
APT annual adjustment mechanism8,416 13,486 
Unrecognized tax benefits32,792 30,921 
Other12,161 11,101 
Total$537,489 $642,128 
Other Non-Operating Income (Expense) Table
Other non-operating income (expense) for the fiscal years ended September 30, 2021, 2020 and 2019 were comprised of the following accounts.
Year Ended September 30
202120202019
(In thousands)
Equity component of AFUDC$32,749 $23,493 $11,165 
Performance-based rate program6,362 6,771 6,737 
Pension and other postretirement non-service credit (cost)(19,238)(3,189)3,016 
Interest income2,144 2,932 4,160 
Community support spending(14,460)(11,728)(4,771)
Miscellaneous(9,702)(11,108)(12,903)
Total$(2,145)$7,171 $7,404 
Supplemental Cash Flow Disclosures
Supplemental disclosures of cash flow information for the fiscal years ended September 30, 2021, 2020 and 2019 were as follows:
 Year Ended September 30
 202120202019
 (In thousands)
Cash Paid (Received) During The Period For:
Interest (1)
$207,555 $194,993 $184,852 
Income taxes$8,199 $(3,071)$11,467 
Non-Cash Transactions:
Capital expenditures included in current liabilities$184,786 $113,365 $149,993 
(1)    Cash paid during the period for interest, net of amounts capitalized was $81.9 million, $82.3 million and $91.3 million for the fiscal years ended September 30, 2021, 2020 and 2019.