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Fair Value of Financial Instruments - Summary of financial instruments (Details) - USD ($) $ in Thousands | Jan. 01, 2022 | Jan. 02, 2021
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Short-term investments | $ 964,582 | $ 521,963
Recurring |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 852,242 | 95,520
Short-term investments | 964,582 | 521,963
Other assets, net | 4,980 | 5,340
Total assets at fair value | 1,821,804 | 622,823
Recurring | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 845,740 | 75,606
Recurring | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 3,552 | 14,995
Short-term investments | 773,461 | 379,390
Recurring | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 2,950 | 4,919
Short-term investments | 191,121 | 142,573
Recurring | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 4,980 | 5,340
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 | 845,740 | 77,961
Short-term investments | 71,509 | 38,461
Total assets at fair value | 917,249 | 116,422
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 | 845,740 | 75,606
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 | 71,509 | 38,461
Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 6,502 | 17,559
Short-term investments | 893,073 | 483,502
Total assets at fair value | 899,575 | 501,061
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 3,552 | 14,995
Short-term investments | 773,461 | 379,390
Recurring | Significant Other Observable Inputs (Level 2) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Cash equivalents | 2,950 | 2,564
Short-term investments | 119,612 | 104,112
Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 4,980 | 5,340
Total assets at fair value | 4,980 | 5,340
Recurring | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | $ 4,980 | $ 5,340

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