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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands | Sep. 28, 2018 | Dec. 29, 2017
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Investment [Line Items] |  |
Amortized Cost | $ 749,814 | $ 440,756
Gross Unrealized Gains | 94 | 18
Gross Unrealized Losses | (607) | (364)
Fair Value | 749,301 | 440,410
Money market funds |  |
Investment [Line Items] |  |
Amortized Cost | 62,325 | 45,478
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 62,325 | 45,478
Certificates of deposit |  |
Investment [Line Items] |  |
Amortized Cost | 19,098 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 19,098 |
Commercial paper |  |
Investment [Line Items] |  |
Amortized Cost | 355,720 | 199,647
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 355,720 | 199,647
Corporate bonds |  |
Investment [Line Items] |  |
Amortized Cost | 262,050 | 179,336
Gross Unrealized Gains | 93 | 18
Gross Unrealized Losses | (549) | (332)
Fair Value | 261,594 | 179,022
U.S. Treasury and government sponsored enterprises |  |
Investment [Line Items] |  |
Amortized Cost | 50,621 | 16,295
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (58) | (32)
Fair Value | $ 50,564 | $ 16,263

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