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Discontinued Operations Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 03, 2021
Dec. 29, 2019
Dec. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
(Loss) gain on disposition of discontinued operations before income taxes $ (76) $ 0 $ (859)
(Benefit from) provision for income taxes on discontinued operations and dispositions 135 195 (1,311)
Disposal Group, Including Discontinued Operation, Liabilities, Current 2,173 2,112  
Fluid Sciences Segment [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
(Loss) gain on disposition of discontinued operations before income taxes (76) 0 (66)
Medical Imaging Business [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
(Loss) gain on disposition of discontinued operations before income taxes $ 0 $ 0 (793)
Multispectral Imaging Business [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
(Loss) gain on disposition of discontinued operations before income taxes     13,000
Disposal Group, Including Discontinued Operation, Consideration     $ 37,300