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Details of Selected Financial Statement Captions - Deferred Charges and Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Balance Sheet Related Disclosures [Abstract]    
Marketable securities $ 104,602 $ 96,012
Regulatory assets (See Note 3) 364,741 368,375
Operating lease right of use assets (See Note 7) 223,366 214,663
Winter Storm Uri incremental costs 10,902 88,500
Assets from risk management activities 381,593 355,784
Pension assets 92,648 29,498
Other 23,306 20,968
Total $ 1,201,158 $ 1,173,800