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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 38,657	$ 35,978	$ 78,893	$ 71,260
Other comprehensive income (loss) net of tax:
Net unrealized gain (loss) on available-for-sale securities	16,277	408	6,501	(2,228)
Related tax benefit (expense)	(5,982)	(150)	(2,389)	819
Other comprehensive income (loss)	10,295	258	4,112	(1,409)
Comprehensive income	$ 48,952	$ 36,236	$ 83,005	$ 69,851

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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