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Balance Sheet Details - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Dec. 30, 2018
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross   $ 630,251    
Unamortized ERP costs   342,820   $ 168,434
Financing liabilities $ 3,774      
Finance lease obligation current 1,380 4,718    
Long-term financing lease obligation 2,394 193,538   $ 0
Depreciation expense 60,000 47,700 $ 39,400  
Enterprise resource planning        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross 23,300 13,100    
Unamortized ERP costs 11,300 3,900    
Amortization of capitalized costs 2,400 2,200 $ 1,700  
Laboratory and Manufacturing Equipment        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross   304,889    
Finance lease right of use asset $ 2,000      
Finance lease period 3 years      
Discount rate 8.20%      
Finance lease obligation current   1,000    
Long-term financing lease obligation   1,000    
Leasehold and building improvements        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross   $ 46,038    
Finance lease right of use asset $ 2,300      
Finance lease period 5 years      
Discount rate 5.00%      
Finance lease obligation current $ 400      
Long-term financing lease obligation $ 1,300