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Balance Sheet Components (Schedule of Changes in Carrying Value of Long-term Investments) (Parentheticals) (Details) - USD ($) $ in Thousands | Oct. 03, 2021 | Dec. 31, 2020 | Sep. 27, 2020
--- | --- | --- | ---
Balance Sheet Related Disclosures [Line Items] |  |  |
Equity investments | $ 7,916 | $ 8,395 |
Limited partnership funds |  |  |
Balance Sheet Related Disclosures [Line Items] |  |  |
Equity investments | 800 | $ 600 | $ 400
Convertible debt securities |  |  |
Balance Sheet Related Disclosures [Line Items] |  |  |
Equity investments | $ 300 |  |

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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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