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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2015		Mar. 31, 2014
Net income	$ 75,687us-gaap_NetIncomeLoss		$ 52,216us-gaap_NetIncomeLoss		$ 91,241us-gaap_NetIncomeLoss		$ 71,504us-gaap_NetIncomeLoss
Other comprehensive income:
Unrealized gain on pension plan obligation	558us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	[1]	528us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	[1]	1,114us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	[1]	1,056us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	[1]
Tax effect of unrealized gain on pension plan	(229)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax		(216)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax		(459)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax		(432)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Total other comprehensive income	329us-gaap_OtherComprehensiveIncomeLossNetOfTax		312us-gaap_OtherComprehensiveIncomeLossNetOfTax		655us-gaap_OtherComprehensiveIncomeLossNetOfTax		624us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income	$ 76,016us-gaap_ComprehensiveIncomeNetOfTax		$ 52,528us-gaap_ComprehensiveIncomeNetOfTax		$ 91,896us-gaap_ComprehensiveIncomeNetOfTax		$ 72,128us-gaap_ComprehensiveIncomeNetOfTax
[1] Amount is included within general and administrative expenses.

X

- Definition

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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