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Inventories - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Oct. 29, 2023 | Oct. 30, 2022
Inventory [Line Items] |  |
Amortization of inventory step-up | $ 3,314 | $ 0
Sierra Wireless |  |
Inventory [Line Items] |  |
Amortization of inventory step-up | $ 3,300 |

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- Definition Amortization Of Inventory Step-Up + References No definition available. + Details
Name: | smtc_AmortizationOfInventoryStepUp
Namespace Prefix: | smtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_InventoryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=smtc_SierraWirelessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |