Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying amount	$ 779,822	$ 710,834
Finite-Lived Intangible Assets, Accumulated Amortization	(333,507)	(268,414)
Indefinite-Lived Intangible Assets, Fair Value			$ 93,000
Indefinite-Lived Intangible Assets, Carrying Value			151,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0	0	58,000
Finite-Lived Intangible Assets, Amortization Expense	$ 64,000	$ 60,000	$ 38,600
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	9 years 2 months 12 days	9 years 6 months
Gross Carrying amount	$ 717,397	$ 644,145
Finite-Lived Intangible Assets, Accumulated Amortization	$ (283,846)	$ (222,661)
Service Backlog
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	1 year 3 months 18 days	2 years 9 months 18 days
Gross Carrying amount	$ 29,426	$ 27,065
Finite-Lived Intangible Assets, Accumulated Amortization	$ (28,283)	$ (24,755)
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	5 years 2 months 12 days	5 years 10 months 24 days
Gross Carrying amount	$ 32,999	$ 39,624
Finite-Lived Intangible Assets, Accumulated Amortization	(21,378)	(20,998)
Tradenames And Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 997,066	$ 918,604