Goodwill By Reportable Segment (Details) - USD ($) $ in Thousands	Apr. 02, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 432,843	$ 437,209
Accumulated impairment of goodwill	(151,229)	(151,229)
Total	281,614	285,980
Photonics
Goodwill [Line Items]
Goodwill	216,908	218,517
Accumulated impairment of goodwill	(102,461)	(102,461)
Total	114,447	116,056
Vision
Goodwill [Line Items]
Goodwill	162,634	165,195
Accumulated impairment of goodwill	(31,722)	(31,722)
Total	130,912	133,473
Precision Motion
Goodwill [Line Items]
Goodwill	53,301	53,497
Accumulated impairment of goodwill	(17,046)	(17,046)
Total	$ 36,255	$ 36,451

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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