Acquisitions and Acquisition-Related Contingent Consideration (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012 2011 Acquisitions [Member]	Dec. 31, 2011 2011 Acquisitions [Member]	Dec. 29, 2012 Other Acquisition [Member]	Jan. 01, 2011 Other Acquisition [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, Potential Cash Payment				$ 5,000		$ 4,000
Acquisition Related Contingent Consideration at Initial Fair Value				3,521		858
Business Acquisition, Contingent Consideration, at Fair Value	$ 4,218	$ 3,911	$ 4,118		$ 100