Segment Information (Narrative) (Details)	9 Months Ended
	Sep. 27, 2015 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
Aerospace and Defense Electronics
Revenue from External Customer [Line Items]
Number of product lines	1
Engineered Systems
Revenue from External Customer [Line Items]
Number of product lines	3