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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 40,361us-gaap_NetIncomeLoss	$ 38,657us-gaap_NetIncomeLoss	$ 78,768us-gaap_NetIncomeLoss	$ 78,893us-gaap_NetIncomeLoss
Other comprehensive income (loss) net of tax:
Net unrealized gain on available-for-sale securities	5,063us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	16,277us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	13,623us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	6,501us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Net unrealized (loss) on long-term borrowing hedge	(4,985)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	(9,233)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Related tax expense	(28)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	(5,982)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	(1,613)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	(2,389)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Other comprehensive income net of tax	50us-gaap_OtherComprehensiveIncomeLossNetOfTax	10,295us-gaap_OtherComprehensiveIncomeLossNetOfTax	2,777us-gaap_OtherComprehensiveIncomeLossNetOfTax	4,112us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 40,411us-gaap_ComprehensiveIncomeNetOfTax	$ 48,952us-gaap_ComprehensiveIncomeNetOfTax	$ 81,545us-gaap_ComprehensiveIncomeNetOfTax	$ 83,005us-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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