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Cash and Investments - Fair Value and Gross Unrealized Losses of Investments Available-for-Sale in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 29, 2019
Dec. 28, 2018
Fair Value    
In an Unrealized Loss Position Less than 12 Months $ 49,233 $ 271,358
In an Unrealized Loss Position 12 Months or Greater 53,000 48,809
Total 102,233 320,167
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (39) (623)
In an Unrealized Loss Position 12 Months or Greater (138) (260)
Total (177) (883)
U.S. Treasury and government sponsored enterprises    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 0 28,105
In an Unrealized Loss Position 12 Months or Greater 7,990 9,182
Total 7,990 37,287
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months 0 (16)
In an Unrealized Loss Position 12 Months or Greater (2) (9)
Total (2) (25)
Corporate bonds    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 49,233 236,162
In an Unrealized Loss Position 12 Months or Greater 45,010 39,627
Total 94,243 275,789
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (39) (606)
In an Unrealized Loss Position 12 Months or Greater (136) (251)
Total $ (175) (857)
Commercial paper    
Fair Value    
In an Unrealized Loss Position Less than 12 Months   7,091
In an Unrealized Loss Position 12 Months or Greater   0
Total   7,091
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months   (1)
In an Unrealized Loss Position 12 Months or Greater   0
Total   $ (1)