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Condensed 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 $ 38,839us-gaap_NetIncomeLoss $ 45,286us-gaap_NetIncomeLoss
Other comprehensive income:    
Reclassifications of net losses on derivative instruments (net of tax of $(278) and $(278), respectively) 391us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 391us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Benefit plans reclassifications of actuarial losses and prior service costs (net of tax of $(91) and $(70), respectively) 131us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax 98us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
Other comprehensive income 522us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 489us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 39,361us-gaap_ComprehensiveIncomeNetOfTax $ 45,775us-gaap_ComprehensiveIncomeNetOfTax