Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying amount	$ 289,449	$ 299,004
Accumulated Amortization	$ (168,369)	$ (139,279)
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	5 years 6 months	6 years 1 month
Gross Carrying amount	$ 251,025	$ 264,373
Accumulated Amortization	$ (136,895)	$ (109,096)
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	0 months	4 months
Gross Carrying amount	$ 13,550	$ 13,763
Accumulated Amortization	$ (13,550)	$ (12,963)
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	4 years 9 months	3 years 9 months
Gross Carrying amount	$ 24,874	$ 20,868
Accumulated Amortization	(17,924)	(17,220)
Tradenames And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 575,091	$ 589,705