Document and Entity Information - shares	6 Months Ended
	Jul. 04, 2015	Jul. 21, 2015
Document and Entity Information
Entity Registrant Name	SILICON LABORATORIES INC
Entity Central Index Key	0001038074
Document Type	10-Q
Document Period End Date	Jul. 04, 2015
Amendment Flag	false
Current Fiscal Year End Date	--01-02
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		42,968,204
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2