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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 | Jun. 29, 2018 | Dec. 29, 2017
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Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | $ 195,947 | $ 154,357
In an Unrealized Loss Position 12 Months or Greater | 4,155 | 22,698
Total | 200,102 | 177,055
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (780) | (319)
In an Unrealized Loss Position 12 Months or Greater | (5) | (45)
Total | (785) | (364)
Corporate bonds |  |
Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | 177,129 | 140,746
In an Unrealized Loss Position 12 Months or Greater | 2,495 | 20,047
Total | 179,624 | 160,793
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (725) | (296)
In an Unrealized Loss Position 12 Months or Greater | (5) | (36)
Total | (730) | (332)
U.S. Treasury and government sponsored enterprises |  |
Fair Value |  |
In an Unrealized Loss Position Less than 12 Months | 18,818 | 13,611
In an Unrealized Loss Position 12 Months or Greater | 1,660 | 2,651
Total | 20,478 | 16,262
Gross Unrealized Losses |  |
In an Unrealized Loss Position Less than 12 Months | (55) | (23)
In an Unrealized Loss Position 12 Months or Greater | 0 | (9)
Total | $ (55) | $ (32)

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