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Goodwill and Intangible Assets - Narrative (Details) $ in Millions | 9 Months Ended
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Oct. 28, 2018 USD ($)
Wireless and Sensing [Member] |
Goodwill [Line Items] |
Goodwill, Transferred from Other Product Group | $ 49.4

X
- Definition Goodwill, Transferred from Other Product Group + References No definition available. + Details
Name: | smtc_GoodwillTransferredfromOtherProductGroup
Namespace Prefix: | smtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ProductOrServiceAxis=smtc_WirelessandSensingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |