Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements Of Comprehensive Income [Abstract]
Net Income Available for Common Stock	$ 82,252	$ 67,944
Other Comprehensive Income (Loss), Before Tax:
Unrealized Gain on Securities Available for Sale Arising During the Period	2,498	789
Unrealized Gain on Derivative Financial Instruments Arising During the Period	2,778	35,350
Reclassification Adjustment for Realized Gains on Derivative Financial Instruments in Net Income	(10,183)	(11,584)
Other Comprehensive Income (Loss), Before Tax	(4,907)	24,555
Income Tax Expense Related to Unrealized Gain on Securities Available for Sale Arising During the Period	925	295
Income Tax Expense Related to Unrealized Gain on Derivative Financial Instruments Arising During the Period	1,271	14,738
Reclassification Adjustment for Income Tax Expense on Realized Gains from Derivative Financial Instruments in Net Income	(4,299)	(4,854)
Income Taxes - Net	(2,103)	10,179
Other Comprehensive Income (Loss)	(2,804)	14,376
Comprehensive Income	$ 79,448	$ 82,320