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Revenues (Net Product Revenues Disaggregated by Product) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 01, 2021	Oct. 02, 2020	Jul. 03, 2020	Apr. 03, 2020	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Disaggregation of Revenue [Line Items]
Net product revenues	$ 270,052	$ 231,092	$ 259,479	$ 226,915	$ 240,310	$ 271,703	$ 240,275	$ 215,487	$ 987,538	$ 967,775	$ 853,826
CABOMETYX
Disaggregation of Revenue [Line Items]
Net product revenues									718,687	733,421	599,946
COMETRIQ
Disaggregation of Revenue [Line Items]
Net product revenues									22,863	26,529	19,333
Net product revenues
Disaggregation of Revenue [Line Items]
Net product revenues									$ 741,550	$ 759,950	$ 619,279

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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