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Collaboration Agreements (Other Collaborations, Narrative) (Details) - USD ($)
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
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Revenues $ 240,310,000 $ 271,703,000 $ 240,275,000 $ 215,487,000 $ 228,602,000 $ 225,397,000 $ 186,108,000 $ 213,719,000 $ 967,775,000 $ 853,826,000 $ 452,477,000
Collaborative Arrangement with Daiichi Sankyo                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Achieved milestone amount                 20,000,000.0 20,000,000  
Maximum amount eligible for development and regulatory milestones $ 90,000,000.0               $ 90,000,000.0    
Termination period                 90 days    
Collaboration Agreement with Daiichi Sankyo                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Collaboration agreement percent of royalty on net sale                 0.50%    
Revenues                 $ 20,100,000 $ 20,000,000.0 $ 0
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    
MINNEBRO | Collaborative Arrangement with Daiichi Sankyo                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Revenues                 $ 100,000