Segment Information (Narrative) (Details)	3 Months Ended
	Apr. 03, 2016 segment product_line
Revenue from External Customer [Line Items]
Number of reportable segments | segment	4
Instrumentation
Revenue from External Customer [Line Items]
Number of product lines	3
Digital Imaging
Revenue from External Customer [Line Items]
Number of product lines	1
Engineered Systems
Revenue from External Customer [Line Items]
Number of product lines	3