Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 63,180		$ 63,180
Amortization of Intangible Assets	9,800	$ 10,500	21,300	$ 17,300
Finite-Lived Intangible Assets, Gross	657,095		657,095		$ 372,670
Finite-Lived Intangible Assets, Accumulated Amortization	(229,019)		(229,019)		(207,334)
Finite-Lived Intangible Assets, Amortization Expense, Year Two	58,686		58,686
Finite-Lived Intangible Assets, Amortization Expense, Year Three	56,172		56,172
Finite-Lived Intangible Assets, Amortization Expense, Year Four	53,462		53,462
Finite-Lived Intangible Assets, Amortization Expense, Year Five	46,392		46,392
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	150,184		150,184
Finite-Lived Intangible Assets, Net	428,076		$ 428,076
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			8 years 2 months	5 years 2 months
Finite-Lived Intangible Assets, Gross	596,526		$ 596,526		330,496
Finite-Lived Intangible Assets, Accumulated Amortization	(190,030)		$ (190,030)		(171,005)
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			1 month	9 months
Finite-Lived Intangible Assets, Gross	20,010		$ 20,010		19,689
Finite-Lived Intangible Assets, Accumulated Amortization	(19,739)		$ (19,739)		(18,081)
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			6 years 3 months	4 years 2 months
Finite-Lived Intangible Assets, Gross	40,559		$ 40,559		22,485
Finite-Lived Intangible Assets, Accumulated Amortization	(19,250)		(19,250)		(18,248)
Tradenames And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 864,695		$ 864,695		$ 615,090