Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Dec. 28, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 787,621		$ 779,822
Finite-Lived Intangible Assets, Accumulated Amortization	(350,795)		$ (333,507)
Amortization of Intangible Assets	16,900	$ 16,100
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	66,969
Finite-Lived Intangible Assets, Amortization Expense, Year Two	62,588
Finite-Lived Intangible Assets, Amortization Expense, Year Three	57,618
Finite-Lived Intangible Assets, Amortization Expense, Year Four	51,337
Finite-Lived Intangible Assets, Amortization Expense, Year Five	37,710
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	160,604
Finite-Lived Intangible Assets, Net	$ 436,826
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years		9 years 2 months 12 days
Finite-Lived Intangible Assets, Gross	$ 722,235		$ 717,397
Finite-Lived Intangible Assets, Accumulated Amortization	$ (299,564)		$ (283,846)
Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 months 24 days		1 year 3 months 18 days
Finite-Lived Intangible Assets, Gross	$ 30,236		$ 29,426
Finite-Lived Intangible Assets, Accumulated Amortization	$ (28,724)		$ (28,283)
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years 8 months 12 days		5 years 2 months 12 days
Finite-Lived Intangible Assets, Gross	$ 35,150		$ 32,999
Finite-Lived Intangible Assets, Accumulated Amortization	(22,507)		(21,378)
Tradenames And Trademarks
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 997,313		$ 997,066