Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 02, 2026	Sep. 26, 2025	Oct. 02, 2026	Sep. 26, 2025
Restructuring and Related Activities [Abstract]
Restructuring expense	$ 92	$ 212	$ 2,711	$ 2,729
Restructuring Reserve [Roll Forward]
Additional Charges	92	212	2,711	2,729
Reduction In Force
Restructuring and Related Activities [Abstract]
Restructuring expense			2,711	2,729
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			151	817
Additional Charges			2,711	2,729
Cash Payments			(2,819)	(3,386)
Restructuring Reserve, Ending Balance	43	160	43	160
Reduction In Force \| Performance Materials
Restructuring and Related Activities [Abstract]
Restructuring expense			694	481
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			0	56
Additional Charges			694	481
Cash Payments			(694)	(537)
Restructuring Reserve, Ending Balance	0	0	0	0
Reduction In Force \| Electronic Materials
Restructuring and Related Activities [Abstract]
Restructuring expense			449	789
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			83	293
Additional Charges			449	789
Cash Payments			(521)	(1,067)
Restructuring Reserve, Ending Balance	11	15	11	15
Reduction In Force \| Precision Optics
Restructuring and Related Activities [Abstract]
Restructuring expense			878	1,428
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			59	60
Additional Charges			878	1,428
Cash Payments			(937)	(1,457)
Restructuring Reserve, Ending Balance	0	31	0	31
Reduction In Force \| Other
Restructuring and Related Activities [Abstract]
Restructuring expense			690	31
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			9	408
Additional Charges			690	31
Cash Payments			(667)	(325)
Restructuring Reserve, Ending Balance	$ 32	$ 114	$ 32	$ 114

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 220
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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