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.

No definition available.

Name:	slab_NotionalAmountOfInterestRateCashFlowHedgeDerivativesMaturedDuringPeriod
Namespace Prefix:	slab_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Derivative Financial Instruments (Details) - Interest rate swaps - USD ($) $ in Millions	Jul. 08, 2016	Dec. 31, 2016
Notional amount
Remaining notional value	$ 72.5
Cash flow hedges
Notional amount
Original notional value		$ 72.5