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Cover Page
Mar. 04, 2021
Jul. 31, 2019
Cover [Abstract]    
Document Type   8-K
Amendment Flag   false
Document Period End Date Mar. 04, 2021  
Entity Registrant Name   EXELIXIS, INC.
Entity Central Index Key   0000939767
Document Fiscal Year Focus   2021
Document Fiscal Period Focus   FY
Entity Emerging Growth Company   false
Title of 12(b) Security   Common Stock $.001 Par Value per Share
Trading Symbol   EXEL
Security Exchange Name   NASDAQ
Entity File Number   000-30235
Entity Incorporation, State or Country Code   DE
Entity Tax Identification Number   04-3257395
Entity Address, Address Line One   1851 Harbor Bay Parkway
Entity Address, City or Town   Alameda
Entity Address, State or Province   CA
Entity Address, Postal Zip Code   94502
City Area Code   650
Local Phone Number   837-7000
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false