Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Fair Value	$ 93,000
Indefinite-Lived Intangible Assets, Carrying Value	151,000
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	8,100
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	58,000	$ 0	$ 0
Gross Carrying amount	372,670	289,449
Finite-Lived Intangible Assets, Accumulated Amortization	$ (207,334)	$ (168,369)
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	5 years 2 months	5 years 6 months
Gross Carrying amount	$ 330,496	$ 251,025
Finite-Lived Intangible Assets, Accumulated Amortization	$ (171,005)	$ (136,895)
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	9 months	0 months
Gross Carrying amount	$ 19,689	$ 13,550
Finite-Lived Intangible Assets, Accumulated Amortization	$ (18,081)	$ (13,550)
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	4 years 2 months	4 years 9 months
Gross Carrying amount	$ 22,485	$ 24,874
Finite-Lived Intangible Assets, Accumulated Amortization	(18,248)	(17,924)
Tradenames And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 615,090	$ 575,091