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Details of Selected Consolidated Balance Sheet Captions - Deferred Credits and Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Balance Sheet Related Disclosures [Abstract]    
Pension and postretirement liabilities $ 91,596 $ 185,617
Operating lease liabilities (See Note 6) 184,301 194,745
Customer advances for construction 8,628 9,879
Other regulatory liabilities (See Note 2) 178,990 75,506
Asset retirement obligation 5,737 18,373
Liabilities from risk management activities 1,129 0
APT annual adjustment mechanism 13,104 8,416
Unrecognized tax benefits (See Note 14) 39,908 32,792
Other 14,909 12,161
Total $ 538,302 $ 537,489