Acquisitions - Intangible Assets Acquired (Details) (RFPD and NuHorizons Combined [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 02, 2011
Intangible Assets Acquired As Part Of Business Combination [Line Items]
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	$ 90,900
Customer Relationships [Member]
Intangible Assets Acquired As Part Of Business Combination [Line Items]
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	35,400
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	8
Trade Names [Member]
Intangible Assets Acquired As Part Of Business Combination [Line Items]
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	49,000
Other Intangibles [Member]
Intangible Assets Acquired As Part Of Business Combination [Line Items]
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	$ 6,500	[1]
Acquired Finite-lived Intangible Asset, Useful Life, Minimum	1
Acquired Finite-lived Intangible Asset, Useful Life, Maximum	3

[1] Consists of non-competition agreements and sales backlog with useful lives ranging from 1 to 3 years.