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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
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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)

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