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Cash and Investments (Summary by Security Type) (Details) - USD ($) $ in Thousands | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
--- | --- | --- | --- | ---
Investments available-for-sale: |  |  |  |
Amortized Cost | $ 828,843 | $ 440,756 |  |
Gross Unrealized Gains | 182 | 18 |  |
Gross Unrealized Losses | (883) | (364) |  |
Fair Value | 828,142 | 440,410 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |  |  |
Amortized Cost | 315,875 | 188,314 | $ 155,836 | $ 144,284
Total, Amortized Cost | 852,322 | 457,522 |  |
Total, Fair Value | 851,621 | 457,176 |  |
Money market funds |  |  |  |
Investments available-for-sale: |  |  |  |
Amortized Cost | 47,744 | 45,478 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | 0 | 0 |  |
Fair Value | 47,744 | 45,478 |  |
Commercial paper |  |  |  |
Investments available-for-sale: |  |  |  |
Amortized Cost | 381,134 | 199,647 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | (1) | 0 |  |
Fair Value | 381,133 | 199,647 |  |
Corporate bonds |  |  |  |
Investments available-for-sale: |  |  |  |
Amortized Cost | 344,741 | 179,336 |  |
Gross Unrealized Gains | 180 | 18 |  |
Gross Unrealized Losses | (857) | (332) |  |
Fair Value | 344,064 | 179,022 |  |
U.S. Treasury and government sponsored enterprises |  |  |  |
Investments available-for-sale: |  |  |  |
Amortized Cost | 55,224 | 16,295 |  |
Gross Unrealized Gains | 2 | 0 |  |
Gross Unrealized Losses | (25) | (32) |  |
Fair Value | 55,201 | 16,263 |  |
Cash and restricted cash |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |  |  |
Amortized Cost | 6,883 | 3,268 |  |
Fair Value | 6,883 | 3,268 |  |
Certificates of deposit |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |  |  |
Amortized Cost | 16,596 | 13,498 |  |
Fair Value | $ 16,596 | $ 13,498 |  |

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