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Derivative Financial Instruments (Details 2) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 29, 2012	Dec. 28, 2013
Derivative Financial Instruments
Notional value of interest rate swap agreement hedging headquarters lease		$ 50,100,000slab_NotionalAmountOfInterestRateCashFlowHedgeDerivativesMaturedDuringPeriod
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent and interest expense during period		900,000us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet
Gains or losses from the hedging instrument which was excluded from the assessment of effectiveness	0us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
Other assets, net
Derivative financial instrument
Fair value of interest rate swap	$ 331,000us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = slab_OtherAssetsNetMember		$ 513,000us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = slab_OtherAssetsNetMember

X

- Definition

Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges that matured during the period. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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- Details

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- Details

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X

- Definition

The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

+ Details

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Period Type:	duration

X

- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

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