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Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Details) - USD ($) $ in Thousands | Apr. 04, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Cash | $ 207,313 | $ 266,609
Commercial Paper, at Carrying Value | 10,000 | 0
Money market instruments | 25,375 | 2,464
Cash and cash equivalents | 242,688 | 269,073
Current investments | 143,233 | 103,240
Non-current investments | 490,363 | 395,125
Total | 876,284 | 767,438
Treasury Bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments | 66,261 | 35,403
Long-term investments | 65,148 | 96,458
Corporate Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments | 50,410 | 32,714
Long-term investments | 334,351 | 203,428
Asset-Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments | 16,645 | 25,160
Long-term investments | 62,755 | 67,058
Agency Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Long-term investments | 18,961 | 19,006
Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments | 1,296 | 1,303
Long-term investments | 5,719 | 5,735
Sovereign Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments | 8,621 | 8,660
Long-term investments | $ 3,429 | $ 3,440

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