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Marketable Securities - Investment Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 27, 2025 | Sep. 28, 2024 | Sep. 27, 2025 | Sep. 28, 2024
Investment income |  |  |  |
Investment income (loss) | $ 1,700 | $ 6,200 | $ 9,600 | $ 14,100
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract] |  |  |  |
Unrealized gain (loss) on equity securities | $ 414 | $ 653 | $ 1,382 | $ 1,038

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