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Details of Selected Consolidated Balance Sheet Captions - Deferred Charges and Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Balance Sheet Related Disclosures [Abstract]    
Marketable securities $ 96,012 $ 108,071
Regulatory assets (See Note 2) 368,375 351,843
Operating lease right of use assets (See Note 6) 214,663 222,446
Winter Storm Uri incremental costs 88,500 89,009
Assets from risk management activities 355,784 175,613
Pension assets 29,498 0
Other 20,968 27,738
Total $ 1,173,800 $ 974,720