XML 22 R1.htm IDEA: XBRL DOCUMENT v3.25.4
COVER - USD ($)
$ in Billions
 12 Months Ended
Jan. 02, 2026
Feb. 02, 2026
Jul. 04, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 02, 2026    
Current Fiscal Year End Date --01-02    
Document Transition Report false    
Entity File Number 000-30235    
Entity Registrant Name EXELIXIS, INC.    
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    
Title of 12(b) Security Common Stock $0.001 Par Value per Share    
Trading Symbol EXEL    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 9.4
Entity Common Stock, Shares Outstanding (in shares)   259,708,689  
Documents Incorporated by Reference
Certain portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than May 2, 2026, in connection with the registrant’s 2026 Annual Meeting of Stockholders are incorporated herein by reference into Part III of this Annual Report on Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000939767