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Nature of Operations and Summary of Significant Accounting Policies - Intangible Assets By Major Asset Class (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2020 | Dec. 28, 2019
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | $ 255,992 | $ 252,085
Accumulated Amortization | (109,539) | (95,333)
Currency Translation | (6,188) | (6,870)
Net | 140,265 | 149,882
Acquired Intangible Assets [Abstract] |  |
Gross | 280,092 | 276,185
Currency Translation | (6,194) | (6,956)
Net | 164,359 | 173,896
Tradenames |  |
Acquired Indefinite-Lived Intangible Assets [Line Items] |  |
Gross | 24,100 | 24,100
Currency Translation | (6) | (86)
Net | 24,094 | 24,014
Customer relationships |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 174,423 | 171,583
Accumulated Amortization | (62,018) | (51,798)
Currency Translation | (3,741) | (4,141)
Net | 108,664 | 115,644
Product technology |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 56,568 | 56,011
Accumulated Amortization | (30,674) | (27,819)
Currency Translation | (1,520) | (1,709)
Net | 24,374 | 26,483
Tradenames |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 6,753 | 6,527
Accumulated Amortization | (2,811) | (2,421)
Currency Translation | (362) | (427)
Net | 3,580 | 3,679
Other |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 18,248 | 17,964
Accumulated Amortization | (14,036) | (13,295)
Currency Translation | (565) | (593)
Net | $ 3,647 | $ 4,076

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