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Marketable Securities - Investment Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 28, 2025 | Jun. 29, 2024 | Jun. 28, 2025 | Jun. 29, 2024
Investment income |  |  |  |
Investment income (loss) | $ 3,100 | $ 3,700 | $ 7,900 | $ 7,800
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract] |  |  |  |
Unrealized gain (loss) on equity securities | $ 97 | $ 151 | $ 968 | $ 385

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