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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 157,364	$ 151,505	$ 138,183
Other comprehensive income (loss) net of tax:
Net unrealized gains (losses) on available-for-sale securities	22,656	(10,953)	(209,832)
Related tax benefit (expense)	(8,326)	4,025	77,113
Reclassification adjustment of net gains from sale of available-for-sale securities included in net income	0	0	95,234
Related tax benefit (expense)	0	0	(34,998)
Other comprehensive income (loss)	14,330	(6,928)	(72,483)
Comprehensive income	$ 171,694	$ 144,577	$ 65,700

X

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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