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Summary of Restructuring Program By Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 03, 2020 | Mar. 29, 2019
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | $ 655 | $ 1,236
2019 Restructuring |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | 569 | 967
2019 Restructuring | Photonics |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | 203 | 193
2019 Restructuring | Vision |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | 289 | 350
2019 Restructuring | Precision Motion |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | 64 | 47
2019 Restructuring | Unallocated Corporate and Shared Services |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring costs | $ 13 | $ 377

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- Definition Amount, after cash payment, 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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