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v3.19.3.a.u2

Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
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Dec. 28, 2019 USD ($)
Commitments and Contingencies |
Funded portion of investment commitment | $ 6.6
High end of range |
Commitments and Contingencies |
Commitment to invest in limited partnership | $ 10.0

X
- Definition The amount of investment commitment which has been funded as of the reporting date. + References No definition available. + Details
Name: | slab_InvestmentCommitmentLimitedPartnershipFundedPortion
Namespace Prefix: | slab_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The maximum aggregate amount to which the Company has committed to invest in a limited partnership. + References No definition available. + Details
Name: | slab_InvestmentCommitmentLimitedPartnershipMaximumAmountOfInvestment
Namespace Prefix: | slab_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |