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Details of Selected Financial Statement Captions - Deferred Charges and Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Balance Sheet Related Disclosures [Abstract]    
Marketable securities $ 110,594 $ 104,602
Regulatory assets (See Note 3) 396,958 364,741
Operating lease right of use assets (See Note 7) 249,556 223,366
Winter Storm Uri incremental costs 6,424 10,902
Assets from risk management activities 94,197 381,593
Pension assets 155,611 92,648
Other 30,343 23,306
Total $ 1,043,683 $ 1,201,158