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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
Sep. 28, 2018
Dec. 29, 2017
Fair Value    
In an Unrealized Loss Position Less than 12 Months $ 218,049 $ 154,357
In an Unrealized Loss Position 12 Months or Greater 11,211 22,698
Total 229,260 177,055
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (565) (319)
In an Unrealized Loss Position 12 Months or Greater (42) (45)
Total (607) (364)
Corporate bonds    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 175,380 140,746
In an Unrealized Loss Position 12 Months or Greater 11,211 20,047
Total 186,591 160,793
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (507) (296)
In an Unrealized Loss Position 12 Months or Greater (42) (36)
Total (549) (332)
U.S. Treasury and government sponsored enterprises    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 42,669 13,611
In an Unrealized Loss Position 12 Months or Greater 0 2,651
Total 42,669 16,262
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months (58) (23)
In an Unrealized Loss Position 12 Months or Greater 0 (9)
Total $ (58) $ (32)