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Goodwill and Other Intangible Assets - Intangible assets (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Dec. 28, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 208,291 $ 186,929
Accumulated Amortization (66,381) (56,896)
Net Amount 141,910 130,033
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 135,217 119,488
Accumulated Amortization (43,174) (36,185)
Net Amount 92,043 83,303
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 8,579 7,579
Accumulated Amortization (7,407) (7,251)
Net Amount 1,172 328
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 64,495 59,862
Accumulated Amortization (15,800) (13,460)
Net Amount $ 48,695 $ 46,402