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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands | Sep. 27, 2019 | Dec. 28, 2018 | Sep. 28, 2018 | Dec. 29, 2017
--- | --- | --- | --- | ---
Investment [Line Items] |  |  |  |
Investments, available-for-sale, Amortized Cost | $ 1,214,736 | $ 828,843 |  |
Investments available-for-sale, Gross Unrealized Gains | 3,692 | 182 |  |
Investments available-for-sale, Gross Unrealized Losses | (91) | (883) |  |
Investments available-for-sale, Fair Value | 1,218,337 | 828,142 |  |
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | 243,317 | 315,875 | $ 355,227 | $ 188,314
Total cash and investments, Amortized Cost | 1,244,826 | 852,322 |  |
Total cash and investments, Gross Unrealized Gains | 3,695 | 182 |  |
Total cash and investments, Gross Unrealized Losses | (91) | (883) |  |
Total cash and investments, Fair Value | 1,248,430 | 851,621 |  |
Money market funds |  |  |  |
Investment [Line Items] |  |  |  |
Investments, available-for-sale, Amortized Cost | 26,641 | 47,744 |  |
Investments available-for-sale, Gross Unrealized Gains | 0 | 0 |  |
Investments available-for-sale, Gross Unrealized Losses | 0 | 0 |  |
Investments available-for-sale, Fair Value | 26,641 | 47,744 |  |
Commercial paper |  |  |  |
Investment [Line Items] |  |  |  |
Investments, available-for-sale, Amortized Cost | 332,239 | 381,134 |  |
Investments available-for-sale, Gross Unrealized Gains | 0 | 0 |  |
Investments available-for-sale, Gross Unrealized Losses | 0 | (1) |  |
Investments available-for-sale, Fair Value | 332,239 | 381,133 |  |
Corporate bonds |  |  |  |
Investment [Line Items] |  |  |  |
Investments, available-for-sale, Amortized Cost | 703,325 | 344,741 |  |
Investments available-for-sale, Gross Unrealized Gains | 3,549 | 180 |  |
Investments available-for-sale, Gross Unrealized Losses | (67) | (857) |  |
Investments available-for-sale, Fair Value | 706,807 | 344,064 |  |
U.S. Treasury and government sponsored enterprises |  |  |  |
Investment [Line Items] |  |  |  |
Investments, available-for-sale, Amortized Cost | 152,531 | 55,224 |  |
Investments available-for-sale, Gross Unrealized Gains | 143 | 2 |  |
Investments available-for-sale, Gross Unrealized Losses | (24) | (25) |  |
Investments available-for-sale, Fair Value | 152,650 | 55,201 |  |
Cash and restricted cash |  |  |  |
Investment [Line Items] |  |  |  |
Investments available-for-sale, Gross Unrealized Gains |  | 0 |  |
Investments available-for-sale, Gross Unrealized Losses |  | 0 |  |
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | 901 | 6,883 |  |
Cash, cash equivalents, and restricted cash, Gross Unrealized Gains | 0 |  |  |
Cash, cash equivalents, and restricted cash, Gross Unrealized Losses | 0 |  |  |
Cash, restricted cash and certificates of deposit, Fair Value | 901 | 6,883 |  |
Certificates of deposit |  |  |  |
Investment [Line Items] |  |  |  |
Investments available-for-sale, Gross Unrealized Gains |  | 0 |  |
Investments available-for-sale, Gross Unrealized Losses |  | 0 |  |
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | 29,189 | 16,596 |  |
Cash, cash equivalents, and restricted cash, Gross Unrealized Gains | 3 |  |  |
Cash, cash equivalents, and restricted cash, Gross Unrealized Losses | 0 |  |  |
Cash, restricted cash and certificates of deposit, Fair Value | $ 29,192 | $ 16,596 |  |

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