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Details of Selected Financial Statement Captions - Other Non-Operating Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Balance Sheet Related Disclosures [Abstract]      
Equity component of AFUDC $ 58,234 $ 64,019 $ 45,505
Performance-based rate program 8,389 7,093 8,327
Pension and other postretirement non-service credit 10,820 8,955 8,337
Interest income 22,887 7,207 2,781
Community support spending (20,016) (12,027) (16,357)
Unrealized gains (losses) on equity securities 3,562 1,406 (7,737)
Miscellaneous (12,830) (6,878) (7,119)
Total $ 71,046 $ 69,775 $ 33,737