Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Available for Common Stock	$ (189,109)	$ 84,740
Other Comprehensive Income (Loss), Before Tax:
Unrealized Gain (Loss) on Securities Available for Sale Arising During the Period	(638)	(412)
Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	65,372	243,829
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	(57,170)	(24,265)
Other Comprehensive Income (Loss), Before Tax	7,564	219,152
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Securities Available for Sale Arising During the Period	(191)	(160)
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	20,676	102,949
Reclassification Adjustment for Income Tax Benefit (Expense) on Realized Losses (Gains) from Derivative Financial Instruments in Net Income	(18,005)	(10,089)
Income Taxes – Net	2,480	92,700
Other Comprehensive Income	5,084	126,452
Comprehensive Income (Loss)	$ (184,025)	$ 211,192