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Details of Selected Financial Statement Captions - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Balance Sheet Related Disclosures [Abstract]    
Customer credit balances and deposits $ 56,185 $ 62,085
Accrued employee costs 69,062 64,141
Deferred gas costs 6,879 9,142
Operating lease liabilities (See Note 7) 45,010 34,340
Accrued interest 122,459 106,116
Liabilities from risk management activities 6,339 7,324
Taxes payable 237,965 215,857
Pension and postretirement liabilities 6,122 4,622
Regulatory cost of removal obligation 108,558 99,217
APT annual adjustment mechanism 68,094 35,924
Regulatory excess deferred taxes (See Note 15) 72,792 79,686
Other 36,092 32,166
Total $ 835,557 $ 750,620