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Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 25, 2020 | Dec. 27, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Total Cost | $ 274,306 | $ 269,663
Total Foreign Currency Translation | (10,628) | (15,100)
Finite Life |  |
Accumulated amortization | (103,018) | (91,940)
Total Book Value | 160,660 | 162,623
Trade Names |  |
Indefinite Life |  |
Cost | 61,920 | 61,920
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (1,572) | (3,730)
Book value | 60,348 | 58,190
Customer Relationships |  |
Finite Life |  |
Cost | 186,073 | 186,310
Accumulated amortization | (90,280) | (80,764)
Foreign currency translation | (8,349) | (10,412)
Book value | $ 87,444 | $ 95,134
Weighted average life in years | 13 years | 13 years
Patents and Proprietary Technology |  |
Finite Life |  |
Cost | $ 25,313 | $ 20,413
Accumulated amortization | (12,380) | (10,526)
Foreign currency translation | (707) | (885)
Book value | $ 12,226 | $ 9,002
Weighted average life in years | 10 years | 10 years
Trademarks, Trade Names and Other |  |
Finite Life |  |
Cost | $ 1,000 | $ 1,020
Accumulated amortization | (358) | (650)
Foreign currency translation | 0 | (73)
Book value | $ 642 | $ 297
Weighted average life in years | 4 years | 4 years

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