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Goodwill and Intangible Assets - Narrative (Details) | 12 Months Ended
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Jan. 28, 2018
Goodwill and Intangible Assets [Line Items] |
Number of reporting units | 3

X
- Definition [Line Items] for Schedule of Goodwill and Intangible Assets [Table] + References No definition available. + Details
Name: | smtc_ScheduleOfGoodwillAndIntangibleAssetsLineItems
Namespace Prefix: | smtc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
Name: | us-gaap_NumberOfReportingUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration