Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 60,398
Amortization of Intangible Assets	16,100	$ 11,500
Finite-Lived Intangible Assets, Gross	718,798		$ 710,834
Finite-Lived Intangible Assets, Accumulated Amortization	(284,869)		(268,414)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	58,675
Finite-Lived Intangible Assets, Amortization Expense, Year Three	54,934
Finite-Lived Intangible Assets, Amortization Expense, Year Four	50,227
Finite-Lived Intangible Assets, Amortization Expense, Year Five	43,895
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	165,800
Finite-Lived Intangible Assets, Net	$ 433,929
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	$ 651,587		644,145
Finite-Lived Intangible Assets, Accumulated Amortization	$ (237,090)		(222,661)
Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years 3 months 18 days	2 years 9 months 18 days
Finite-Lived Intangible Assets, Gross	$ 28,096		27,065
Finite-Lived Intangible Assets, Accumulated Amortization	$ (26,019)		(24,755)
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years 9 months 18 days	5 years 10 months 24 days
Finite-Lived Intangible Assets, Gross	$ 39,115		39,624
Finite-Lived Intangible Assets, Accumulated Amortization	(21,760)		(20,998)
Tradenames And Trademarks
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 937,456		$ 918,604