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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

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