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Nature of Operations and Summary of Significant Accounting Policies - Intangible Assets By Major Asset Class (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Acquired Definite-Lived Intangible Assets [Line Items]    
Gross $ 178,755 $ 178,783
Currency Translation (4,850) (1,655)
Accumulated Amortization (68,312) (60,997)
Net 105,593 116,131
Acquired Intangible Assets [Abstract]    
Gross 195,355 195,383
Currency Translation (4,801) (1,350)
Net 122,242 133,036
Trade Names [Member]    
Acquired Indefinite-Lived Intangible Assets [Line Items]    
Gross 16,600 16,600
Currency Translation 49 305
Net 16,649 16,905
Customer Relationships [Member]    
Acquired Definite-Lived Intangible Assets [Line Items]    
Gross 113,283 113,301
Currency Translation (3,058) (621)
Accumulated Amortization (33,555) (28,789)
Net 76,670 83,891
Product Technology [Member]    
Acquired Definite-Lived Intangible Assets [Line Items]    
Gross 46,501 46,501
Currency Translation (1,351) (737)
Accumulated Amortization (21,733) (19,841)
Net 23,417 25,923
Trade Names [Member]    
Acquired Definite-Lived Intangible Assets [Line Items]    
Gross 5,227 5,227
Currency Translation (345) (262)
Accumulated Amortization (1,747) (1,504)
Net 3,135 3,461
Other Intangibles [Member]    
Acquired Definite-Lived Intangible Assets [Line Items]    
Gross 13,744 13,754
Currency Translation (96) (35)
Accumulated Amortization (11,277) (10,863)
Net $ 2,371 $ 2,856