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Fair Value of Financial Instruments - Summary of financial instruments (Details) - USD ($) $ in Thousands | Sep. 28, 2019 | Dec. 29, 2018
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | $ 457,879 | $ 416,779
Recurring |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 133,363 | 103,148
Total short-term investments | 457,879 | 416,779
Other assets, net | 5,715 | 5,759
Total assets at fair value | 596,957 | 525,686
Recurring | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 128,072 | 74,990
Recurring | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 5,291 | 18,820
Total short-term investments | 298,454 | 269,427
Recurring | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 9,338
Total short-term investments | 159,425 | 147,352
Recurring | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 5,715 | 5,759
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 128,072 | 84,328
Total short-term investments | 80,686 | 48,141
Total assets at fair value | 208,758 | 132,469
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 128,072 | 74,990
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 9,338
Total short-term investments | 80,686 | 48,141
Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 5,291 | 18,820
Total short-term investments | 377,193 | 368,638
Total assets at fair value | 382,484 | 387,458
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 5,291 | 18,820
Total short-term investments | 298,454 | 269,427
Recurring | Significant Other Observable Inputs (Level 2) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 78,739 | 99,211
Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 5,715 | 5,759
Total assets at fair value | 5,715 | 5,759
Recurring | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | $ 5,715 | $ 5,759

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