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Defined Contribution Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Defined Contribution Plan Disclosure [Line Items] |  |  |
Contributions to defined contribution plans | $ 1.1 | $ 1.0 | $ 0.9
U.S. [Member] | 401 (K) Retirement and Savings Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of employee contributions, eligible for employer match | 50.00% |  |
Percentage of employee contributions | 6.00% |  |
Ireland [Member] | Defined Contribution PRSA Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of employee contributions, eligible for employer match | 6.00% |  |
Percentage of employee contributions | 8.00% |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
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
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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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
Name: | us-gaap_RetirementPlanNameAxis=srdx_FourZeroOneKRetirementAndSavingsPlanMember
Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
Name: | us-gaap_RetirementPlanNameAxis=srdx_DefinedContributionPersonalRetirementSavingsAccountPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |