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Details of Selected Consolidated Balance Sheet Captions - Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Balance Sheet Related Disclosures [Abstract]    
Deferred gas costs $ 119,742 $ 66,395
Winter Storm Uri incremental costs 2,020,954 2,011,719
Prepaid expenses 58,551 48,766
Taxes receivable 11,911 0
Materials and supplies 25,880 15,581
Assets from risk management activities 26,207 55,073
Other 11,245 3,375
Total $ 2,274,490 $ 2,200,909