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Insider Trading Arrangements
 3 Months Ended 9 Months Ended
Sep. 29, 2023
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Sep. 29, 2023
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Trading Arrangements, by Individual    
Material Terms of Trading Arrangement   Patrick J. Haley, our Executive Vice President, Commercial, an officer for purposes of Section 16 of the Exchange Act, entered into a pre-arranged stock trading plan on August 7, 2023. Mr. Haley’s trading plan provides for the sale of up to 120,149 shares of our common stock (including shares obtained from the exercise of vested stock options covered by the trading plan) between November 6, 2023 and August 7, 2024. This trading plan is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and Exelixis’ policies regarding transactions in Exelixis securities.
Non-Rule 10b5-1 Arrangement Adopted false  
Rule 10b5-1 Arrangement Terminated false  
Non-Rule 10b5-1 Arrangement Terminated false  
Patrick J. Haley [Member]    
Trading Arrangements, by Individual    
Name Patrick J. Haley  
Title Executive Vice President, Commercial  
Rule 10b5-1 Arrangement Adopted true  
Adoption Date August 7, 2023  
Arrangement Duration 275 days  
Aggregate Available 120,149 120,149