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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. 30, 2018
Dec. 29, 2017
Fair Value    
In an Unrealized Loss Position Less than 12 Months $ 184,459 $ 154,357
In an Unrealized Loss Position 12 Months or Greater 11,732 22,698
Total 196,191 177,055
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months 874 319
In an Unrealized Loss Position 12 Months or Greater 26 45
Total 900 364
Corporate bonds    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 167,459 140,746
In an Unrealized Loss Position 12 Months or Greater 9,077 20,047
Total 176,536 160,793
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months 822 296
In an Unrealized Loss Position 12 Months or Greater 21 36
Total 843 332
U.S. Treasury and government sponsored enterprises    
Fair Value    
In an Unrealized Loss Position Less than 12 Months 17,000 13,611
In an Unrealized Loss Position 12 Months or Greater 2,655 2,651
Total 19,655 16,262
Gross Unrealized Losses    
In an Unrealized Loss Position Less than 12 Months 52 23
In an Unrealized Loss Position 12 Months or Greater 5 9
Total $ 57 $ 32