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Details of Selected Financial Statement Captions - Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Balance Sheet Related Disclosures [Abstract]    
Deferred gas costs $ 159,762 $ 148,297
Winter Storm Uri incremental costs 3,949 21,213
Prepaid expenses 74,780 58,029
Taxes receivable 14,332 13,918
Materials and supplies 16,961 34,297
Assets from risk management activities 2,091 4,071
Other 16,193 12,211
Total $ 288,068 $ 292,036