Segment Information (Narrative) (Details) $ in Millions	3 Months Ended
Apr. 02, 2017 USD ($) segment product_line	Apr. 03, 2016 USD ($)
Revenue from External Customer [Line Items]
Number of reportable segments \| segment	4
Restructuring costs	$ 0.4	$ 1.1
Restructuring reserve included in other current liabilities	$ 2.9
Instrumentation
Revenue from External Customer [Line Items]
Number of product lines \| product_line	3
Digital Imaging
Revenue from External Customer [Line Items]
Number of product lines \| product_line	1
Cost Of Sales And Sales General And Administrative Expenses \| e2v
Revenue from External Customer [Line Items]
Transaction costs	$ 12.9
Cost Of Sales And Sales General And Administrative Expenses \| e2v \| Digital Imaging
Revenue from External Customer [Line Items]
Transaction costs	2.5
Cost Of Sales And Sales General And Administrative Expenses \| Corporate, Non-Segment \| e2v
Revenue from External Customer [Line Items]
Transaction costs	$ 10.4

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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