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Revenues (Net Product Revenues Disaggregated by Product) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 29, 2018	Jun. 29, 2018	Mar. 31, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Disaggregation of Revenue [Line Items]
Net product revenues	$ 240,310	$ 271,703	$ 240,275	$ 215,487	$ 228,602	$ 225,397	$ 186,108	$ 213,719	$ 967,775	$ 853,826	$ 452,477
CABOMETYX
Disaggregation of Revenue [Line Items]
Net product revenues									733,421	599,946	324,000
COMETRIQ
Disaggregation of Revenue [Line Items]
Net product revenues									26,529	19,333	25,008
Net product revenues
Disaggregation of Revenue [Line Items]
Net product revenues									$ 759,950	$ 619,279	$ 349,008

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+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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