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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 |  |

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