Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Available for Common Stock	$ (54,158)	$ 92,620	$ 245,134	$ 403,189
Other Comprehensive Income (Loss), Before Tax:
Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	(21,936)	65,244	238,395	673,381
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	(75,346)	(57,692)	(155,203)	120,590
Other Comprehensive Income (Loss), Before Tax	(97,282)	7,552	83,192	793,971
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	(6,086)	17,885	66,146	184,655
Reclassification Adjustment for Income Tax Benefit (Expense) on Realized Losses (Gains) from Derivative Financial Instruments in Net Income	(20,906)	(15,813)	(43,064)	32,967
Income Taxes (Benefits) – Net	(26,992)	2,072	23,082	217,622
Other Comprehensive Income (Loss)	(70,290)	5,480	60,110	576,349
Comprehensive Income (Loss)	$ (124,448)	$ 98,100	$ 305,244	$ 979,538