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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands | Jun. 29, 2018 | Dec. 29, 2017
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Investment [Line Items] |  |
Amortized Cost | $ 595,607 | $ 440,756
Gross Unrealized Gains | 54 | 18
Gross Unrealized Losses | (785) | (364)
Fair Value | 594,876 | 440,410
Money market funds |  |
Investment [Line Items] |  |
Amortized Cost | 54,546 | 45,478
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 54,546 | 45,478
Certificates of deposit |  |
Investment [Line Items] |  |
Amortized Cost | 21,095 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 21,095 |
Commercial paper |  |
Investment [Line Items] |  |
Amortized Cost | 280,654 | 199,647
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 280,654 | 199,647
Corporate bonds |  |
Investment [Line Items] |  |
Amortized Cost | 218,780 | 179,336
Gross Unrealized Gains | 54 | 18
Gross Unrealized Losses | (730) | (332)
Fair Value | 218,104 | 179,022
U.S. Treasury and government sponsored enterprises |  |
Investment [Line Items] |  |
Amortized Cost | 20,532 | 16,295
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (55) | (32)
Fair Value | $ 20,477 | $ 16,263

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