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