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Organization and Basis of Presentation (Fiscal Year) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 28, 2018 weeks | Oct. 29, 2017 weeks | Oct. 28, 2018 weeks week
52 Week Fiscal Year [Member] |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Number of weeks in the fiscal year reporting period |  |  | 52
Number of weeks in a quarter for 52 week fiscal period | 13 | 13 | 13
53 Week Fiscal Year [Member] |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Number of weeks in the fiscal year reporting period |  |  | 53
Number of weeks in the 4th quarter for 53 week fiscal period | week |  |  | 14

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- Definition Number Of Weeks In A Quarter For Fifty Two Weeks Fiscal Period + References No definition available. + Details
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Namespace Prefix: | smtc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Weeks in Reporting Period + References No definition available. + Details
Name: | smtc_NumberofWeeksinReportingPeriod
Namespace Prefix: | smtc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of weeks for the fourth quarter for a 53-week fiscal year. + References No definition available. + Details
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Namespace Prefix: | smtc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Organization And Basis Of Presentation [Line Items] + References No definition available. + Details
Name: | smtc_OrganizationAndBasisOfPresentationLineItems
Namespace Prefix: | smtc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | smtc_FiscalYearPeriodAxis=smtc_FiftyTwoWeekFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | smtc_FiscalYearPeriodAxis=smtc_FiftyThreeWeekFiscalYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |