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Stockholders’ Equity - Estimated Grant-Date Fair Value (Details) - $ / shares	12 Months Ended
	Jan. 03, 2025	Dec. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
TSR-Based Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average grant date fair value, awarded (in dollars per share)	$ 20.19	$ 26.05
Fair value of Exelixis common stock on grant date (in dollars per share)	$ 21.71	$ 19.48	$ 20.70
Expected volatility	36.68%	40.26%	46.85%
Risk-free interest rate	4.42%	3.75%	1.59%
Dividend yield	0.00%	0.00%	0.00%
Performance stock units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average grant date fair value, awarded (in dollars per share)	$ 24.54		$ 33.17	$ 24.54
Fair value of Exelixis common stock on grant date (in dollars per share)				$ 21.31
Expected volatility				49.21%
Risk-free interest rate				0.29%
Dividend yield				0.00%

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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