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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Income Taxes    
Income tax expense reduction due to research and experimentation tax credit $ 5,063us-gaap_IncomeTaxReconciliationTaxCreditsResearch  
Estimated decrease in liability for unrecognized tax benefits 115us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit  
Unrecognized tax benefits that, if recognized, would affect the effective tax rate 13,613us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 12,807us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Accrued interest and penalties 1,236us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 1,158us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized Tax Benefits $ 23,075us-gaap_UnrecognizedTaxBenefits $ 22,687us-gaap_UnrecognizedTaxBenefits