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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands | Mar. 29, 2019 | Dec. 28, 2018 | Mar. 30, 2018 | Dec. 29, 2017
--- | --- | --- | --- | ---
Investment [Line Items] |  |  |  |
Amortized Cost | $ 991,239 | $ 828,843 |  |
Amortized Cost | 375,037 | 315,875 | $ 234,335 | $ 188,314
Gross Unrealized Gains | 1,298 | 182 |  |
Gross Unrealized Losses | (177) | (883) |  |
Fair Value | 992,360 | 828,142 |  |
Total cash and investments, amortized cost | 1,018,248 | 852,322 |  |
Total cash and investments, fair value | 1,019,369 | 851,621 |  |
Money market funds |  |  |  |
Investment [Line Items] |  |  |  |
Amortized Cost | 75,171 | 47,744 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | 0 | 0 |  |
Fair Value | 75,171 | 47,744 |  |
Commercial paper |  |  |  |
Investment [Line Items] |  |  |  |
Amortized Cost | 414,317 | 381,134 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | 0 | (1) |  |
Fair Value | 414,317 | 381,133 |  |
Corporate bonds |  |  |  |
Investment [Line Items] |  |  |  |
Amortized Cost | 417,303 | 344,741 |  |
Gross Unrealized Gains | 1,257 | 180 |  |
Gross Unrealized Losses | (175) | (857) |  |
Fair Value | 418,385 | 344,064 |  |
U.S. Treasury and government sponsored enterprises |  |  |  |
Investment [Line Items] |  |  |  |
Amortized Cost | 84,448 | 55,224 |  |
Gross Unrealized Gains | 41 | 2 |  |
Gross Unrealized Losses | (2) | (25) |  |
Fair Value | 84,487 | 55,201 |  |
Cash and restricted cash |  |  |  |
Investment [Line Items] |  |  |  |
Amortized Cost | 1,019 | 6,883 |  |
Fair Value | 1,019 | 6,883 |  |
Certificates of deposit |  |  |  |
Investment [Line Items] |  |  |  |
Amortized Cost | 25,990 | 16,596 |  |
Fair Value | $ 25,990 | $ 16,596 |  |

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