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Collaboration Agreements (Royalty Revenues under the Collaboration Agreement with Genentech) (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
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Royalty revenues on ex-U.S. sales	$ 270,052	$ 231,092	$ 259,479	$ 226,915	$ 240,310	$ 271,703	$ 240,275	$ 215,487	$ 987,538	$ 967,775	$ 853,826
Collaborative Arrangement with Genentech
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Profits on U.S. commercialization									6,261	4,615	8,084
Royalty revenues on ex-U.S. sales									$ 5,079	$ 5,679	$ 5,564

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