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Significant Accounting Policies - Revenue Recognition (Details) | 12 Months Ended
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Jan. 02, 2021
Revenue Recognition |
Product replacement warranty | 1 year

X
- Definition Duration of a warranty period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
Name: | slab_StandardProductWarrantyReplacementPeriod
Namespace Prefix: | slab_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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