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Stock-based Compensation - Schedule of Fair Value at the Date of Grant (Detail)
 6 Months Ended
Mar. 31, 2015
Fiscal 2013 (2013 - 2015) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Shares 8,551srdx_MinimumSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodTwoMember
Target Shares 42,753srdx_TargetSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodTwoMember
Maximum Shares 85,506srdx_MaximumSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodTwoMember
Fiscal 2014 (2014 - 2016) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Shares 7,861srdx_MinimumSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodThreeMember
Target Shares 39,303srdx_TargetSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodThreeMember
Maximum Shares 78,606srdx_MaximumSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodThreeMember
Fiscal 2015 (2015 - 2017) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Shares 8,440srdx_MinimumSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodFourMember
Target Shares 42,199srdx_TargetSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodFourMember
Maximum Shares 84,398srdx_MaximumSharesToBeAwardedOnBasisOfPerformance
/ us-gaap_AwardDateAxis
= srdx_PeriodFourMember