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Revenues (Revenues by Disaggregated Category) (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]
Total revenues	$ 240,310	$ 271,703	$ 240,275	$ 215,487	$ 228,602	$ 225,397	$ 186,108	$ 213,719	$ 967,775	$ 853,826	$ 452,477
Gross product revenues
Disaggregation of Revenue [Line Items]
Total revenues									957,621	738,529	402,569
Discounts and allowances
Disaggregation of Revenue [Line Items]
Total revenues									(197,671)	(119,250)	(53,561)
Net product revenues
Disaggregation of Revenue [Line Items]
Total revenues									759,950	619,279	349,008
License revenues
Disaggregation of Revenue [Line Items]
Total revenues									161,299	192,188	96,637
Research and development service revenues
Disaggregation of Revenue [Line Items]
Total revenues									49,965	39,501	8,737
Other collaboration revenues
Disaggregation of Revenue [Line Items]
Total revenues									(3,439)	2,858	(1,905)
Total collaboration revenues
Disaggregation of Revenue [Line Items]
Total revenues									$ 207,825	$ 234,547	$ 103,469

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+ 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
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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