Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2025	Jun. 28, 2024	Jun. 27, 2025	Jun. 28, 2024
Restructuring and Related Activities [Abstract]
Restructuring expense	$ 479	$ 3,048	$ 2,517	$ 4,668
Restructuring Reserve [Roll Forward]
Additional Charges	479	3,048	2,517	4,668
Reduction In Force
Restructuring and Related Activities [Abstract]
Restructuring expense			2,517	4,668
Restructuring Reserve [Roll Forward]
Beginning balance			817	390
Additional Charges			2,517	4,668
Cash Payments			(2,831)	(4,003)
Ending balance	503	1,055	503	1,055
Reduction In Force | Performance Materials
Restructuring and Related Activities [Abstract]
Restructuring expense			481	1,307
Restructuring Reserve [Roll Forward]
Beginning balance			56	2
Additional Charges			481	1,307
Cash Payments			(433)	(996)
Ending balance	104	313	104	313
Reduction In Force | Electronic Materials
Restructuring and Related Activities [Abstract]
Restructuring expense			577	1,389
Restructuring Reserve [Roll Forward]
Beginning balance			293	388
Additional Charges			577	1,389
Cash Payments			(859)	(1,632)
Ending balance	11	145	11	145
Reduction In Force | Precision Optics
Restructuring and Related Activities [Abstract]
Restructuring expense			1,428	713
Restructuring Reserve [Roll Forward]
Beginning balance			60	0
Additional Charges			1,428	713
Cash Payments			(1,305)	(533)
Ending balance	183	180	183	180
Reduction In Force | Other
Restructuring and Related Activities [Abstract]
Restructuring expense			31	1,259
Restructuring Reserve [Roll Forward]
Beginning balance			408	0
Additional Charges			31	1,259
Cash Payments			(234)	(842)
Ending balance	$ 205	$ 417	$ 205	$ 417