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Stockholders’ Equity - Estimate Grant-Date Fair Value (Details) - TSR-Based Restricted Stock Units
6 Months Ended
Jun. 28, 2024
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average grant date fair value, awarded (in dollars per share) $ 20.19
Fair value of Exelixis common stock on grant date (in dollars per share) $ 21.71
Expected volatility 36.68%
Risk-free interest rate 4.42%
Dividend yield 0.00%