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Stock-based Compensation - Schedule of Fair Value at the Date of Grant (Detail) | 9 Months Ended
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Jun. 30, 2018 shares
Fiscal 2016 (2016 - 2018) [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Minimum Shares | 11,910
Target Shares | 59,548
Maximum Shares | 119,096
Fiscal 2017 (2017 - 2019) [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Minimum Shares | 9,352
Target Shares | 46,758
Maximum Shares | 93,516

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- Definition Maximum number of performance shares to be awarded based on performance criteria set as part of the performance share award program. + References No definition available. + Details
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Namespace Prefix: | srdx_
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Balance Type: | na
Period Type: | duration

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- Definition Minimum number of performance shares to be awarded based on performance criteria set as part of the performance share award program. + References No definition available. + Details
Name: | srdx_MinimumSharesToBeAwardedOnBasisOfPerformance
Namespace Prefix: | srdx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Shares that would be issued under performance share award agreements based on achievement at target levels. + References No definition available. + Details
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Namespace Prefix: | srdx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |