Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 793,246		$ 793,246		$ 779,822
Finite-Lived Intangible Assets, Accumulated Amortization	(368,647)		(368,647)		(333,507)
Amortization of Intangible Assets	17,600	$ 14,700	34,500	$ 30,800
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	66,606		66,606
Finite-Lived Intangible Assets, Amortization Expense, Year Two	61,875		61,875
Finite-Lived Intangible Assets, Amortization Expense, Year Three	56,171		56,171
Finite-Lived Intangible Assets, Amortization Expense, Year Four	48,743		48,743
Finite-Lived Intangible Assets, Amortization Expense, Year Five	37,113		37,113
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	154,091		154,091
Finite-Lived Intangible Assets, Net	424,599		$ 424,599
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			8 years 9 months 18 days	9 years 2 months 12 days
Finite-Lived Intangible Assets, Gross	727,586		$ 727,586		717,397
Finite-Lived Intangible Assets, Accumulated Amortization	(315,960)		$ (315,960)		(283,846)
Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 months 6 days	1 year 3 months 18 days
Finite-Lived Intangible Assets, Gross	31,336		$ 31,336		29,426
Finite-Lived Intangible Assets, Accumulated Amortization	(29,541)		$ (29,541)		(28,283)
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			4 years 3 months 18 days	5 years 2 months 12 days
Finite-Lived Intangible Assets, Gross	34,324		$ 34,324		32,999
Finite-Lived Intangible Assets, Accumulated Amortization	(23,146)		(23,146)		(21,378)
Tradenames And Trademarks
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 1,005,203		$ 1,005,203		$ 997,066