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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Statement of Comprehensive Income [Abstract] |  |  |
Net Income Available for Common Stock | $ 77,513 | $ 476,866 | $ 566,021
Other Comprehensive Income (Loss), Before Tax: |  |  |
Increase (Decrease) in the Funded Status of the Pension and Other Post-Retirement Benefit Plans | (17,511) | (9,660) | 9,561
Reclassification Adjustment for Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans | 2,507 | 1,674 | 11,054
Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period | 286,894 | 708,206 | (1,050,831)
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income | (216,655) | 88,656 | 882,581
Other Post-Retirement Adjustment for Regulatory Proceeding | 0 | 0 | (7,351)
Other Comprehensive Income (Loss), Before Tax | 55,235 | 788,876 | (154,986)
Income Tax Expense (Benefit) Related to the Increase (Decrease) in the Funded Status of the Pension and Other Post-Retirement Benefit Plans | (3,996) | (2,284) | 2,169
Reclassification Adjustment for Income Tax Benefit Related to the Amortization of the Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans | 584 | 411 | 2,574
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period | 81,197 | 214,270 | (287,608)
Reclassification Adjustment for Income Tax Benefit (Expense) on Realized Losses (Gains) from Derivative Financial Instruments in Net Income | (62,134) | 5,806 | 241,559
Income Tax Expense (Benefit) Related to Other Post-Retirement Adjustment for Regulatory Proceeding | 0 | 0 | (1,544)
Income Taxes — Net | 15,651 | 218,203 | (42,850)
Other Comprehensive Income (Loss) | 39,584 | 570,673 | (112,136)
Comprehensive Income | $ 117,097 | $ 1,047,539 | $ 453,885

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