Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 17,563	$ 18,789
Other comprehensive income, net of tax:
Changes in unrealized holding losses on AFS securities, net of deferred income taxes of $2,313 and $115, respectively	(3,805)	(256)
Comprehensive income	$ 13,758	$ 18,533