Acquisitions and Acquisition-Related Contingent Consideration (Details Textual) (USD $)	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Business Acquisition [Line Items]
Acquisition related costs	$ 1,000,000	$ 3,400,000
2014 Acquisitions [Member]
Business Acquisition [Line Items]
Number of businesses acquired	2
Total cash consideration paid, net of cash acquired	27,500,000
Cash acquired	2,100,000
Goodwill acquired during period	20,800,000
Finite-lived intangibles acquired during period	16,900,000
Recognized identifiable assets acquired and liabilities assumed, net	(8,100,000)
Goodwill, expected tax deductible amount	$ 545,000
Acquired definite-lived intangible assets, weighted average useful life	9 years