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Fair Value Measurements - Investment Impairments and Credit Loss Reserves (Details) - USD ($) $ in Millions | Oct. 26, 2025 | Jan. 26, 2025
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Fair Value Disclosures [Abstract] |  |
Credit loss reserve for held-to-maturity debt securities and available for sale debt securities | $ 4.5 | $ 4.5

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- Definition Debt Securities, Allowance For Credit Loss + References No definition available. + Details
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Namespace Prefix: | smtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration