Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 26, 2025	Sep. 27, 2024
Restructuring and Related Activities [Abstract]
Restructuring expense	$ 212	$ 1,493	$ 2,729	$ 6,161
Restructuring Reserve [Roll Forward]
Additional Charges	212	1,493	2,729	6,161
Reduction In Force
Restructuring and Related Activities [Abstract]
Restructuring expense			2,729	6,161
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			817	390
Additional Charges			2,729	6,161
Cash Payments			(3,386)	(5,198)
Restructuring Reserve, Ending Balance	160	1,353	160	1,353
Reduction In Force | Performance Materials
Restructuring and Related Activities [Abstract]
Restructuring expense			481	1,441
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			56	2
Additional Charges			481	1,441
Cash Payments			(537)	(1,270)
Restructuring Reserve, Ending Balance	0	173	0	173
Reduction In Force | Electronic Materials
Restructuring and Related Activities [Abstract]
Restructuring expense			789	1,804
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			293	388
Additional Charges			789	1,804
Cash Payments			(1,067)	(2,019)
Restructuring Reserve, Ending Balance	15	173	15	173
Reduction In Force | Precision Optics
Restructuring and Related Activities [Abstract]
Restructuring expense			1,428	1,198
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			60	0
Additional Charges			1,428	1,198
Cash Payments			(1,457)	(755)
Restructuring Reserve, Ending Balance	31	443	31	443
Reduction In Force | Other
Restructuring and Related Activities [Abstract]
Restructuring expense			31	1,718
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance			408	0
Additional Charges			31	1,718
Cash Payments			(325)	(1,154)
Restructuring Reserve, Ending Balance	$ 114	$ 564	$ 114	$ 564