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Income Taxes - Summary of Changes in the Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 25, 2026 | Jan. 26, 2025 | Jan. 28, 2024
Income Tax Disclosure [Abstract] |  |  |
Beginning balance | $ 328,203 | $ 304,355 | $ 156,850
Additions | 20,537 | 35,071 | 147,505
Releases | (12,474) | (11,223) | 0
Ending balance | $ 336,266 | $ 328,203 | $ 304,355

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- Definition Valuation Allowance Additions + References No definition available. + Details
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Period Type: | duration

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- Definition Valuation Allowance Releases + References No definition available. + Details
Name: | smtc_ValuationAllowanceReleases
Namespace Prefix: | smtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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Namespace Prefix: | us-gaap_
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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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