Cover	Mar. 11, 2020
Cover [Abstract]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Mar. 11, 2020
Entity File Number	000-29823
Entity Registrant Name	SILICON LABORATORIES INC.
Entity Central Index Key	0001038074
Entity Tax Identification Number	74-2793174
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common Stock, $0.0001 par value
Trading Symbol	SLAB
Security Exchange Name	NASDAQ
Entity Emerging Growth Company	false