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Organization and Summary of Significant Accounting Policies (Estimated Useful Lives of Property Plant And Equipment) (Details)
12 Months Ended
Dec. 29, 2017
Building [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 40 years
Lab equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Furniture and fixtures [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years
Computer equipment and software [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Leasehold improvements [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 7 years
Leasehold improvements [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 15 years