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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 29, 2019 | Dec. 28, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | $ 992,360 | $ 828,142
Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 992,360 | 828,142
Financial assets | 1,018,350 | 844,738
Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 75,171 | 47,744
Financial assets | 75,171 | 47,744
Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 917,189 | 780,398
Financial assets | 943,179 | 796,994
Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 75,171 | 47,744
Money market funds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 75,171 | 47,744
Money market funds | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 75,171 | 47,744
Money market funds | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 0 | 0
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 414,317 | 381,133
Commercial paper | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 414,317 | 381,133
Commercial paper | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 0 | 0
Commercial paper | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 414,317 | 381,133
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 418,385 | 344,064
Corporate bonds | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 418,385 | 344,064
Corporate bonds | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 0 | 0
Corporate bonds | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 418,385 | 344,064
U.S. Treasury and government sponsored enterprises |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 84,487 | 55,201
U.S. Treasury and government sponsored enterprises | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 84,487 | 55,201
U.S. Treasury and government sponsored enterprises | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 0 | 0
U.S. Treasury and government sponsored enterprises | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total investments available-for-sale | 84,487 | 55,201
Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certificates of deposit | 25,990 | 16,596
Certificates of deposit | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certificates of deposit | 25,990 | 16,596
Certificates of deposit | Level 1 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certificates of deposit | 0 | 0
Certificates of deposit | Level 2 | Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Certificates of deposit | $ 25,990 | $ 16,596

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