Document and Entity Information	May 27, 2020
Cover [Abstract]
Amendment Flag	false
Entity Central Index Key	0001038074
Document Type	8-K
Document Period End Date	May 27, 2020
Entity Registrant Name	SILICON LABORATORIES INC.
Entity Incorporation State Country Code	DE
Entity File Number	000-29823
Entity Tax Identification Number	74-2793174
Entity Address, Address Line One	400 West Cesar Chavez
Entity Address, City or Town	Austin
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78701
City Area Code	(512)
Local Phone Number	416-8500
Written Communications	false
Soliciting Material	false
Pre Commencement Tender Offer	false
Pre Commencement Issuer Tender Offer	false
Security 12b Title	Common Stock, $0.0001 par value
Trading Symbol	SLAB
Security Exchange Name	NASDAQ
Entity Emerging Growth Company	false