Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 64,293		$ 64,293
Amortization of Intangible Assets	14,700	$ 9,800	30,800	$ 21,300
Finite-Lived Intangible Assets, Gross	762,055		762,055		$ 710,834
Finite-Lived Intangible Assets, Accumulated Amortization	(299,857)		(299,857)		(268,414)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	61,657		61,657
Finite-Lived Intangible Assets, Amortization Expense, Year Three	58,333		58,333
Finite-Lived Intangible Assets, Amortization Expense, Year Four	52,828		52,828
Finite-Lived Intangible Assets, Amortization Expense, Year Five	45,602		45,602
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	179,485		179,485
Finite-Lived Intangible Assets, Net	462,198		$ 462,198
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			9 years 6 months	9 years 6 months
Finite-Lived Intangible Assets, Gross	705,379		$ 705,379		644,145
Finite-Lived Intangible Assets, Accumulated Amortization	(252,831)		$ (252,831)		(222,661)
Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			2 years	2 years 9 months 18 days
Finite-Lived Intangible Assets, Gross	27,797		$ 27,797		27,065
Finite-Lived Intangible Assets, Accumulated Amortization	(26,447)		$ (26,447)		(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	28,879		$ 28,879		39,624
Finite-Lived Intangible Assets, Accumulated Amortization	(20,579)		(20,579)		(20,998)
Tradenames And Trademarks
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 980,557		$ 980,557		$ 918,604