Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 66,374		$ 66,374
Amortization of Intangible Assets	17,300	$ 17,600	48,100	$ 38,800
Finite-Lived Intangible Assets, Gross	773,182		773,182		$ 710,834
Finite-Lived Intangible Assets, Accumulated Amortization	(317,458)		(317,458)		(268,414)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	62,474		62,474
Finite-Lived Intangible Assets, Amortization Expense, Year Three	59,370		59,370
Finite-Lived Intangible Assets, Amortization Expense, Year Four	52,902		52,902
Finite-Lived Intangible Assets, Amortization Expense, Year Five	43,887		43,887
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	170,717		170,717
Finite-Lived Intangible Assets, Net	455,724		$ 455,724
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			9 years 3 months 18 days	9 years 6 months
Finite-Lived Intangible Assets, Gross	714,398		$ 714,398		644,145
Finite-Lived Intangible Assets, Accumulated Amortization	(268,653)		$ (268,653)		(222,661)
Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			1 year 8 months 12 days	2 years 9 months 18 days
Finite-Lived Intangible Assets, Gross	29,075		$ 29,075		27,065
Finite-Lived Intangible Assets, Accumulated Amortization	(27,697)		$ (27,697)		(24,755)
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			4 years 9 months 18 days	5 years 10 months 24 days
Finite-Lived Intangible Assets, Gross	29,709		$ 29,709		39,624
Finite-Lived Intangible Assets, Accumulated Amortization	(21,108)		(21,108)		(20,998)
Tradenames And Trademarks
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 984,697		$ 984,697		$ 918,604