Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income Available for Common Stock	$ 44,986	$ 133,020
Other Comprehensive Income (Loss), Before Tax:
Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	(53,516)	189,167
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	(29,504)	(19,708)
Other Comprehensive Income (Loss), Before Tax	(83,020)	169,459
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	(14,403)	52,486
Reclassification Adjustment for Income Tax Benefit (Expense) on Realized Losses (Gains) from Derivative Financial Instruments in Net Income	(7,940)	(5,468)
Income Taxes – Net	(22,343)	47,018
Other Comprehensive Income (Loss)	(60,677)	122,441
Comprehensive Income (Loss)	$ (15,691)	$ 255,461