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Regulatory Matters (Tables)
 12 Months Ended
Sep. 30, 2024
Regulatory Assets and Liabilities, Other Disclosure [Abstract]  
Schedule of Regulatory Assets and Liabilities
The Company has recorded the following regulatory assets and liabilities:
 At September 30
 20242023
 (Thousands)
Regulatory Assets:
Pension Costs(1) (Note K)$30,259 $20,459 
Post-Retirement Benefit Costs(1) (Note K)7,932 2,536 
Recoverable Future Taxes (Note G)80,084 69,045 
System Modernization / Improvement Tracker (2) (See Regulatory
Mechanisms in Note A)
47,043 30,375 
Asset Retirement Obligations(1) (Note E)21,951 19,384 
Unamortized Debt Expense (Note A)5,604 7,240 
Other(3)39,101 35,757 
Total Regulatory Assets231,974 184,796 
Less: Amounts Included in Other Current Assets(38,264)(36,373)
Total Long-Term Regulatory Assets$193,710 $148,423 
 
 At September 30
 20242023
 (Thousands)
Regulatory Liabilities:
Cost of Removal Regulatory Liability$292,477 $277,694 
Taxes Refundable to Customers (Note G)305,645 268,562 
Post-Retirement Benefit Costs(5) (Note K)141,199 159,760 
Amounts Payable to Customers (See Regulatory Mechanisms in Note A)42,720 59,019 
Environmental Site Remediation Costs(4) (Note L)5,390 619 
Other(6)34,215 43,167 
Total Regulatory Liabilities821,646 808,821 
Less: Amounts included in Current and Accrued Liabilities(72,072)(97,124)
Total Long-Term Regulatory Liabilities$749,574 $711,697 
(1)Included in Other Regulatory Assets on the Consolidated Balance Sheets.
(2)$15,681 and $19,584 are included in Other Current Assets on the Consolidated Balance Sheets at September 30, 2024 and 2023, respectively, since such amounts are expected to be recovered from ratepayers in the next 12 months. $31,362 and $10,791 are included in Other Regulatory Assets on the Consolidated Balance Sheets at September 30, 2024 and 2023, respectively.
(3)$22,583 and $16,789 are included in Other Current Assets on the Consolidated Balance Sheets at September 30, 2024 and 2023, respectively, since such amounts are expected to be recovered from ratepayers in the next 12 months. $16,518 and $18,968 are included in Other Regulatory Assets on the Consolidated Balance Sheets at September 30, 2024 and 2023, respectively.
(4)Included in Other Regulatory Liabilities on the Consolidated Balance Sheets.
(5)$5,800 is included in Other Accruals and Current Liabilities on the Consolidated Balance Sheets at both September 30, 2024 and 2023, since such amounts are expected to be passed back to ratepayers in the next 12 months. $135,399 and $153,960 are included in Other Regulatory Liabilities on the Consolidated Balance Sheets at September 30, 2024 and 2023, respectively.
(6)$23,552 and $32,305 are included in Other Accruals and Current Liabilities on the Consolidated Balance Sheets at September 30, 2024 and 2023, respectively, since such amounts are expected to be passed back to ratepayers in the next 12 months. $10,663 and $10,862 are included in Other Regulatory Liabilities on the Consolidated Balance Sheets at September 30, 2024 and 2023, respectively.