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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