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Goodwill and Intangible Assets - Schedule of Indefinite-lived Intangible Assets (Details) - In-process research and development - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 26, 2020 | Jan. 28, 2018
Indefinite-lived Intangible Assets [Roll Forward] |  |
Indefinite-lived intangible asset | $ 0 | $ 2,300
Beginning balance, indefinite-lived intangible assets | 2,300 |
Transfers to core technologies | (2,300) |
Ending balance, indefinite-lived intangible assets | $ 0 |

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- Definition Indefinite-Lived Intangible Assets, Transferred + References No definition available. + Details
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Namespace Prefix: | smtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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