Summary of Significant Accounting Policies - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying amount	$ 198,242	$ 173,037
Accumulated Amortization	(111,846)	(87,350)
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	4 years 8 months 12 days	5 years 1 month 6 days
Gross Carrying amount	167,278	144,298
Accumulated Amortization	(84,312)	(61,506)
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	0 days	0 days
Gross Carrying amount	11,178	10,851
Accumulated Amortization	(11,178)	(10,851)
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	4 years 7 months 6 days	3 years 10 months 24 days
Gross Carrying amount	19,786	17,888
Accumulated Amortization	(16,356)	(14,993)
Tradenames And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 405,635	$ 362,257