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Stock Repurchase Program - Narrative (Details) - USD ($) | Mar. 11, 2021 | Oct. 26, 2025
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Equity [Abstract] |  |
Additional stock repurchase amount authorized | $ 350,000,000 |
Remaining authorization under stock repurchase program |  | $ 209,400,000

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- Definition Stock Repurchase Program, Increase In Authorized Amount + References No definition available. + Details
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Namespace Prefix: | smtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant