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Details of Selected Financial Statement Captions - Deferred Credits and Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Balance Sheet Related Disclosures [Abstract]    
Pension and postretirement liabilities $ 67,322 $ 66,523
Operating lease liabilities (See Note 7) 224,498 194,452
Customer advances for construction 7,973 9,158
Other regulatory liabilities (See Note 3) 279,979 242,049
Asset retirement obligation 7,942 5,174
Liabilities from risk management activities 313 824
APT annual adjustment mechanism 37,195 15,344
Unrecognized tax benefits (See Note 15) 46,174 46,620
Other 20,536 19,754
Total $ 691,932 $ 599,898