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Details of Selected Financial Statement Captions - Deferred Credits and Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Balance Sheet Related Disclosures [Abstract]    
Pension and postretirement liabilities $ 66,523 $ 91,596
Operating lease liabilities (See Note 7) 194,452 184,301
Customer advances for construction 9,158 8,628
Other regulatory liabilities (See Note 3) 242,049 178,990
Asset retirement obligation 5,174 5,737
Liabilities from risk management activities 824 1,129
APT annual adjustment mechanism 15,344 13,104
Unrecognized tax benefits (See Note 15) 46,620 39,908
Other 19,754 14,909
Total $ 599,898 $ 538,302