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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 38,407us-gaap_NetIncomeLoss	$ 40,236us-gaap_NetIncomeLoss
Other comprehensive income (loss) net of tax:
Net unrealized gain (loss) on available-for-sale securities	8,560us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	(9,661)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Net unrealized (loss) on long-term borrowing hedge	(4,249)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Related tax benefit (expense)	(1,584)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	3,478us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Other comprehensive income (loss)	2,727us-gaap_OtherComprehensiveIncomeLossNetOfTax	(6,183)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 41,134us-gaap_ComprehensiveIncomeNetOfTax	$ 34,053us-gaap_ComprehensiveIncomeNetOfTax

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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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