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Product Warranties - Current and Long Term Warranty (Details) - USD ($) $ in Thousands | Mar. 28, 2020 | Dec. 28, 2019 | Mar. 30, 2019 | Dec. 29, 2018
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Product Warranties Disclosures [Abstract] |  |  |  |
Current - in the next twelve months | $ 8,280 | $ 7,940 |  |
Long-term - beyond one year | 7,941 | 7,925 |  |
Total | $ 16,221 | $ 15,865 | $ 15,511 | $ 15,450

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