Document and Entity Information (USD $)	12 Months Ended
	Jan. 03, 2015	Jan. 27, 2015	Jun. 27, 2014
Document and Entity Information
Entity Registrant Name	SILICON LABORATORIES INC
Entity Central Index Key	0001038074
Document Type	10-K
Document Period End Date	Jan. 03, 2015
Amendment Flag	false
Current Fiscal Year End Date	--01-03
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,981,015,271
Entity Common Stock, Shares Outstanding		42,137,503
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY