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Collaboration Agreements (Collaboration Revenue - Takeda) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Product supply agreement revenue $ 349,008 $ 135,375 $ 34,158
Collaboration revenues 103,469 56,079 3,014
Collaborative arrangement with Takeda [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Amortization of upfront payments and deferred milestone 10,377    
Development cost reimbursements 4,320    
Product supply agreement revenue 82    
Collaboration revenues $ 14,779 $ 0 $ 0