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Fair Value of Financial Instruments - Summary of financial instruments (Details) - USD ($) $ in Thousands | Jan. 02, 2021 | Dec. 28, 2019
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Short-term investments | $ 521,963 | $ 498,825
Recurring |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 95,520 | 93,704
Short-term investments | 521,963 | 498,825
Other assets, net | 5,340 | 5,647
Total assets at fair value | 622,823 | 598,176
Recurring | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 75,606 | 92,379
Recurring | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 4,919 |
Short-term investments | 142,573 | 171,871
Recurring | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 14,995 | 1,325
Short-term investments | 379,390 | 326,954
Recurring | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 5,340 | 5,647
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 77,961 | 92,379
Short-term investments | 38,461 | 85,189
Total assets at fair value | 116,422 | 177,568
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 |  |
Cash equivalents | 75,606 | 92,379
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 |  |
Cash equivalents | 2,355 |
Short-term investments | 38,461 | 85,189
Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 17,559 | 1,325
Short-term investments | 483,502 | 413,636
Total assets at fair value | 501,061 | 414,961
Recurring | Significant Other Observable Inputs (Level 2) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 2,564 |
Short-term investments | 104,112 | 86,682
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 14,995 | 1,325
Short-term investments | 379,390 | 326,954
Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 5,340 | 5,647
Total assets at fair value | 5,340 | 5,647
Recurring | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | $ 5,340 | $ 5,647

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