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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Dec. 28, 2024
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 199,171	$ 201,090	$ 201,090
Foreign currency translation	1,687		(802)
Goodwill, ending balance	200,858		199,171
China Operations
Goodwill [Roll Forward]
Reduction - divesture		(1,117)
Probe Cards
Goodwill [Roll Forward]
Goodwill, beginning balance	177,369	178,424	178,424
Foreign currency translation	0		0
Goodwill, ending balance	177,369		177,369
Probe Cards | China Operations
Goodwill [Roll Forward]
Reduction - divesture		(1,055)
Systems
Goodwill [Roll Forward]
Goodwill, beginning balance	21,802	22,666	22,666
Foreign currency translation	1,687		(802)
Goodwill, ending balance	$ 23,489		$ 21,802
Systems | China Operations
Goodwill [Roll Forward]
Reduction - divesture		$ (62)

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