Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income Available for Common Stock	$ 169,689	$ 132,392
Other Comprehensive Income, Before Tax:
Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	297,593	163,132
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	159,342	162,588
Other Comprehensive Income, Before Tax	456,935	325,720
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	81,377	44,649
Reclassification Adjustment for Income Tax Benefit (Expense) on Realized Losses (Gains) from Derivative Financial Instruments in Net Income	43,571	44,500
Income Taxes – Net	124,948	89,149
Other Comprehensive Income	331,987	236,571
Comprehensive Income	$ 501,676	$ 368,963