Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net Income Available for Common Stock	$ 84,740	$ 82,252
Other Comprehensive Income (Loss), Before Tax:
Unrealized Gain (Loss) on Securities Available for Sale Arising During the Period	(412)	2,498
Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	243,829	2,778
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	(24,265)	(10,183)
Other Comprehensive Income (Loss), Before Tax	219,152	(4,907)
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Securities Available for Sale Arising During the Period	(160)	925
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	102,949	1,271
Reclassification Adjustment for Income Tax Benefit (Expense) on Realized Losses (Gains) from Derivative Financial Instruments in Net Income	(10,089)	(4,299)
Income Taxes – Net	92,700	(2,103)
Other Comprehensive Income (Loss)	126,452	(2,804)
Comprehensive Income	$ 211,192	$ 79,448