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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Income Tax Disclosure [Line Items]          
Income tax provisions associated with income from continuing operations $ 1,480,000us-gaap_IncomeTaxExpenseBenefit $ 1,212,000us-gaap_IncomeTaxExpenseBenefit $ 2,950,000us-gaap_IncomeTaxExpenseBenefit $ 2,678,000us-gaap_IncomeTaxExpenseBenefit  
Effective tax rates 32.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 33.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 30.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 30.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
U.S. federal statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate   35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Discrete tax benefit     200,000srdx_DiscreteTaxBenefit    
Gain on sale of investment 500,000us-gaap_GainLossOnInvestments        
Gain on contingent consideration payment       681,000srdx_GainLossOnSaleOfStrategicInvestment  
Gain on debt securities available for sale securities portfolio       100,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet  
Income tax expense from discontinued operations 0srdx_IncomeTaxExpenseFromDiscontinuedOperations     0srdx_IncomeTaxExpenseFromDiscontinuedOperations  
Unrecognized tax benefits including interest and penalties 900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Intersect ENT [Member]          
Income Tax Disclosure [Line Items]          
Gain on sale of investment 500,000us-gaap_GainLossOnInvestments
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= srdx_IntersectEntIncMember		   500,000us-gaap_GainLossOnInvestments
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= srdx_IntersectEntIncMember		    
Maximum [Member]          
Income Tax Disclosure [Line Items]          
Discrete tax benefit $ 100,000srdx_DiscreteTaxBenefit
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 100,000srdx_DiscreteTaxBenefit
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 200,000srdx_DiscreteTaxBenefit
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 200,000srdx_DiscreteTaxBenefit
/ us-gaap_RangeAxis
= us-gaap_MaximumMember