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Cover Page
Jul. 31, 2019
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 03, 2021
Entity Registrant Name EXELIXIS, INC.
Entity Central Index Key 0000939767
Document Fiscal Year Focus 2020
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