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Cash and Investments (Gross Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 28, 2018 | Dec. 29, 2017
--- | --- | ---
Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | $ 271,358 | $ 154,357
In an Unrealized Loss Position 12 Months or Greater | 48,809 | 22,698
Total | 320,167 | 177,055
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (623) | (319)
In an Unrealized Loss Position 12 Months or Greater | (260) | (45)
Total | (883) | (364)
Corporate bonds |  |
Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | 236,162 | 140,746
In an Unrealized Loss Position 12 Months or Greater | 39,627 | 20,047
Total | 275,789 | 160,793
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (606) | (296)
In an Unrealized Loss Position 12 Months or Greater | (251) | (36)
Total | (857) | (332)
U.S. Treasury and government sponsored enterprises |  |
Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | 28,105 | 13,611
In an Unrealized Loss Position 12 Months or Greater | 9,182 | 2,651
Total | 37,287 | 16,262
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (16) | (23)
In an Unrealized Loss Position 12 Months or Greater | (9) | (9)
Total | (25) | $ (32)
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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