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CONDENSED 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	$ 60,903us-gaap_NetIncomeLoss	$ 172,971us-gaap_NetIncomeLoss	$ 184,223us-gaap_NetIncomeLoss	$ 180,664us-gaap_NetIncomeLoss
Other comprehensive income, net of tax
Unrealized (loss) gain on available for sale securities, net of tax of $380, $(11), $(75) and $203, respectively	(550)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	15us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	109us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(295)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Net unrealized gain (loss) on derivatives, net of tax of $(68), $89, $(50) and $109, respectively	118us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	(152)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	87us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	(186)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Adjustment to postemployment benefit obligation, net of tax of $(168), $(112), $(337) and $(223), respectively	239us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	161us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	486us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	322us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive (loss) income	(193)us-gaap_OtherComprehensiveIncomeLossNetOfTax	24us-gaap_OtherComprehensiveIncomeLossNetOfTax	682us-gaap_OtherComprehensiveIncomeLossNetOfTax	(159)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 60,710us-gaap_ComprehensiveIncomeNetOfTax	$ 172,995us-gaap_ComprehensiveIncomeNetOfTax	$ 184,905us-gaap_ComprehensiveIncomeNetOfTax	$ 180,505us-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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