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Product Warranties - Current and Long Term Warranty (Details) - USD ($) $ in Thousands | Oct. 02, 2021 | Jan. 02, 2021 | Sep. 26, 2020 | Dec. 28, 2019
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Product Warranties Disclosures [Abstract] |  |  |  |
Current - in the next twelve months | $ 6,080 | $ 5,918 |  |
Long-term - beyond one year | 11,198 | 10,191 |  |
Total | $ 17,278 | $ 16,109 | $ 15,063 | $ 15,865

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