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Revenues (Revenues by Disaggregated Category) (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]
Total revenues	$ 270,052	$ 231,092	$ 259,479	$ 226,915	$ 240,310	$ 271,703	$ 240,275	$ 215,487	$ 987,538	$ 967,775	$ 853,826
Gross product revenues
Disaggregation of Revenue [Line Items]
Total revenues									962,591	957,621	738,529
Discounts and allowances
Disaggregation of Revenue [Line Items]
Total revenues									(221,041)	(197,671)	(119,250)
Net product revenues
Disaggregation of Revenue [Line Items]
Total revenues									741,550	759,950	619,279
License revenues
Disaggregation of Revenue [Line Items]
Total revenues									167,295	165,914	200,272
Collaboration services revenues
Disaggregation of Revenue [Line Items]
Total revenues									78,693	41,911	34,275
Total collaboration revenues
Disaggregation of Revenue [Line Items]
Total revenues									$ 245,988	$ 207,825	$ 234,547

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