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v3.23.1

Fair Value Measurements - Investment Impairments and Credit Loss Reserves (Details) - USD ($) $ in Millions | Apr. 30, 2023 | Jan. 29, 2023
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Fair Value Disclosures [Abstract] |  |
Credit loss reserve for held-to-maturity debt securities and available for sale debt securities | $ 4.2 | $ 4.2

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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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration