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Collaboration Agreements - Other Collaborations (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Sep. 28, 2018 | Sep. 29, 2017 | Sep. 28, 2018 | Sep. 29, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Royalty revenues on ex-U.S. sales |  | $ 225,397 | $ 152,510 | $ 625,224 | $ 332,405
Collaboration Revenues |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Royalty revenues on ex-U.S. sales |  | $ 62,451 | $ 56,094 | $ 182,170 | $ 79,108
Collaboration Revenues | Collaborative arrangements with Daiichi Sankyo |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Royalty revenues on ex-U.S. sales | $ 20,000 |  |  |  |

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