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Details of Selected Financial Statement Captions - Deferred Credits and Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Balance Sheet Related Disclosures [Abstract]    
Pension and postretirement liabilities $ 68,398 $ 67,322
Operating lease liabilities (See Note 7) 262,549 224,498
Customer advances for construction 9,573 7,973
Other regulatory liabilities (See Note 3) 332,017 279,979
Asset retirement obligation 7,428 7,942
Liabilities from risk management activities 146 313
APT annual adjustment mechanism 31,299 37,195
Unrecognized tax benefits (See Note 15) 50,210 46,174
Other 22,702 20,536
Total $ 784,322 $ 691,932