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v3.8.0.1

Segment Information - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 29, 2017 | Oct. 29, 2017 reportable_segment operating_segment | Jan. 31, 2016 reportable_segment operating_segment
Segment Reporting Information [Line Items] |  |  |
Number of operating segments that aggregate into one reportable segment | operating_segment |  | 4 | 4
Number of reportable segments | reportable_segment |  | 1 | 1
Net sales [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Minimum concentration risk threshold | 10.00% | 10.00% |

X
- Definition Concentration Risk, Minimum Concentration Risk Threshold, Percentage + References No definition available. + Details
Name: | smtc_ConcentrationRiskMinimumConcentrationRiskThresholdPercentage
Namespace Prefix: | smtc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Operating Segments that Aggregate into One Reportable Segment + References No definition available. + Details
Name: | smtc_NumberofOperatingSegmentsthatAggregateintoOneReportableSegment
Namespace Prefix: | smtc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |