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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Net income	$ 15,554us-gaap_NetIncomeLoss		$ 19,288us-gaap_NetIncomeLoss
Other comprehensive income:
Unrealized gain on pension plan obligation	556us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	[1]	528us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	[1]
Tax effect of unrealized gain on pension plan	(230)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax		(216)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Total other comprehensive income	326us-gaap_OtherComprehensiveIncomeLossNetOfTax		312us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income	$ 15,880us-gaap_ComprehensiveIncomeNetOfTax		$ 19,600us-gaap_ComprehensiveIncomeNetOfTax
[1] Amount is included within general and administrative expenses.

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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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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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