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Defined Contribution Plan (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Defined Contribution Plan (Textual) [Abstract] |  |  |
Percentage of employee contributions | 50.00% |  |
Percentage of employee eligible compensation | 6.00% |  |
Contribution expense | $ 0.2 | $ 0.3 | $ 0.1

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- Details
Name: | srdx_DefinedContributionPlanTextualAbstract
Namespace Prefix: | srdx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration