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Fair Value Measurements - Investment Impairments and Credit Loss Reserves (Details) - USD ($) $ in Millions	Apr. 27, 2025	Jan. 26, 2025
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

Name:	smtc_DebtSecuritiesAllowanceForCreditLoss
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