Summary of Significant Accounting Policies - Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying amount	$ 173,037	$ 103,390
Accumulated Amortization	(87,350)	(59,037)
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	5 years 1 month 6 days	3 years 3 months 18 days
Gross Carrying amount	144,298	76,763
Accumulated Amortization	(61,506)	(40,349)
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	0 days	1 year
Gross Carrying amount	10,851	8,751
Accumulated Amortization	(10,851)	(6,713)
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Weighted Avg Remaining LIfe	3 years 10 months 24 days	3 years 3 months 18 days
Gross Carrying amount	17,888	17,876
Accumulated Amortization	(14,993)	(11,975)
Tradenames And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 362,257	$ 188,988