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Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 24, 2021 | Dec. 25, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Total Cost | $ 284,112 | $ 274,080
Total Foreign Currency Translation | (9,419) | (6,354)
Finite Life |  |
Accumulated amortization | (120,329) | (107,057)
Total Book Value | 154,364 | 160,669
Trade Names |  |
Indefinite Life |  |
Cost | 62,633 | 61,920
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (1,350) | 188
Book value | 61,283 | 62,108
Customer Relationships |  |
Finite Life |  |
Cost | 194,505 | 186,073
Accumulated amortization | (104,892) | (93,832)
Foreign currency translation | (7,414) | (6,004)
Book value | $ 82,199 | $ 86,237
Weighted average life in years | 13 years | 13 years
Patents and Proprietary Technology |  |
Finite Life |  |
Cost | $ 26,074 | $ 25,187
Accumulated amortization | (15,023) | (12,924)
Foreign currency translation | (655) | (538)
Book value | $ 10,396 | $ 11,725
Weighted average life in years | 10 years | 10 years
Trademarks, Trade Names and Other |  |
Finite Life |  |
Cost | $ 900 | $ 900
Accumulated amortization | (414) | (301)
Foreign currency translation | 0 | 0
Book value | $ 486 | $ 599
Weighted average life in years | 5 years | 5 years

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