Segment Information - Narrative (Details) $ in Millions	3 Months Ended
Apr. 04, 2021 USD ($) product_line segment	Mar. 29, 2020 USD ($)
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	1
Employee Severance And Facility Consolidation
Revenue from External Customer [Line Items]
Restructuring charges \| $	$ 1.0	$ 3.7
Restructuring reserve \| $	$ 1.3

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+ References

No definition available.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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