Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Statement of Comprehensive Income [Abstract]
Net Income Available for Common Stock	$ 181,645	$ 44,986
Other Comprehensive Income (Loss), Before Tax:
Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	49,098	(53,516)
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	(13,274)	(29,504)
Other Comprehensive Income (Loss), Before Tax	35,824	(83,020)
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	13,146	(14,403)
Reclassification Adjustment for Income Tax Benefit (Expense) on Realized Losses (Gains) from Derivative Financial Instruments in Net Income	(3,554)	(7,940)
Income Taxes (Benefits) – Net	9,592	(22,343)
Other Comprehensive Income (Loss)	26,232	(60,677)
Comprehensive Income (Loss)	$ 207,877	$ (15,691)