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Investments (Narrative) (Details)
12 Months Ended
Dec. 29, 2017
USD ($)
investment
Dec. 30, 2016
USD ($)
investment
Jan. 01, 2016
USD ($)
Aug. 31, 2016
Investment [Line Items]        
Gain (loss) on sale of available-for-sale securities $ 0 $ 0 $ 0  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | investment 134 86    
Other-than-temporary impairment charges on available-for-sale securities $ 0 $ 0 0  
Akarna Therapeutics, Ltd. [Member]        
Investment [Line Items]        
Realized gain on sale of cost method investment $ 3,000,000 2,500,000 $ 0  
Cost method investment ownership percentage       9.00%
Silicon Valley Bank Term Loan and Line of Credit [Member]        
Investment [Line Items]        
Collateral balance   $ 81,600,000