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Collaboration Agreements (Other Collaborations, Narrative) (Details) - USD ($)
 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]                      
Total revenues $ 270,052,000 $ 231,092,000 $ 259,479,000 $ 226,915,000 $ 240,310,000 $ 271,703,000 $ 240,275,000 $ 215,487,000 $ 987,538,000 $ 967,775,000 $ 853,826,000
Collaborative Arrangement with Genentech                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Total revenues                 5,079,000 5,679,000 5,564,000
Collaboration Agreement with Daiichi Sankyo                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Achieved milestone amount                   20,000,000.0 20,000,000.0
Maximum amount eligible for development and regulatory milestones $ 90,000,000.0               90,000,000.0    
Total revenues                 $ 1,300,000 20,100,000 $ 20,000,000.0
Termination period                 90 days    
Collaboration Agreement with Daiichi Sankyo | MINNEBRO                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Total revenues                 $ 1,300,000 $ 100,000  
Profit Sharing Tier One | Collaborative Arrangement with Genentech                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Percent of profits                 50.00%    
Profit Sharing Tier Two | Collaborative Arrangement with Genentech | Minimum                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Profit threshold                 $ 200,000,000.0    
Profit Sharing Tier Three | Collaborative Arrangement with Genentech                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Percent of profits                 30.00%    
Profit Sharing Tier Three | Collaborative Arrangement with Genentech | Maximum                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Profit threshold                 $ 400,000,000.0