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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 37,338	$ 35,163	$ 108,598	$ 102,651
Other comprehensive income (loss) net of tax:
Net unrealized gain (loss) on available-for-sale securities	(10,697)	(3,869)	(12,925)	(36,447)
Related tax benefit (expense)	3,931	1,422	4,750	13,394
Reclassification adjustment of net gain from sale of available-for-sale securities included in net income	0	0	0	0
Related tax benefit (expense)	0	0	0	0
Other comprehensive income (loss)	(6,766)	(2,447)	(8,175)	(23,053)
Comprehensive income	$ 30,572	$ 32,716	$ 100,423	$ 79,598

X

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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