Acquisitions and Acquisition-Related Contingent Consideration (Details Textual) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013	Jun. 13, 2014 Jasper [Member]	Sep. 27, 2014 Other 2014 Acquisitions [Member]	Sep. 27, 2014 Other 2014 Acquisitions [Member] acquisition
Business Acquisition [Line Items]
Cash and cash equivalents acquired					$ 28,700,000
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			102,025,000				20,300,000
Finite-lived intangibles acquired during period							16,900,000
Recognized identifiable assets acquired and liabilities assumed, net							(8,100,000)
Acquired definite-lived intangible assets, weighted average useful life						8 years
Goodwill, expected tax deductible amount						2,823,000	2,823,000
Acquisition related costs	0	0	3,700,000	8,200,000
Business Acquisition Net Consideration Paid to Acquire Business Net of Cash Acquired					$ 139,500,000