Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements Of Comprehensive Income [Abstract]
Net Income Available for Common Stock	$ 43,184	$ 46,891	$ 171,275	$ 221,045
Other Comprehensive Income (Loss), Before Tax:
Foreign Currency Translation Adjustment			0	17
Reclassification Adjustment for Realized Foreign Currency Translation Loss in Net Income			0	34
Unrealized Gain (Loss) on Securities Available for Sale Arising During the Period	(1,870)	23	1,959	3,461
Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	30,432	26,378	47,085	(41,602)
Reclassification Adjustment for Realized (Gains) Losses on Derivative Financial Instruments in Net Income	(21,599)	3,185	(49,649)	(13,080)
Other Comprehensive Income (Loss), Before Tax	6,963	29,586	(605)	(51,170)
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Securities Available for Sale Arising During the Period	(701)	8	723	1,306
Income Tax Expense (Benefit) Related to Unrealized Gain (Loss) on Derivative Financial Instruments Arising During the Period	12,688	10,810	14,346	(17,136)
Reclassification Adjustment for Income Tax (Expense) Benefit on Realized (Gains) Losses from Derivative Financial Instruments In Net Income	(8,973)	1,345	(15,433)	(5,227)
Income Taxes - Net	3,014	12,163	(364)	(21,057)
Other Comprehensive Income (Loss)	3,949	17,423	(241)	(30,113)
Comprehensive Income	$ 47,133	$ 64,314	$ 171,034	$ 190,932