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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 201,090	$ 211,444
Foreign currency translation	(802)	306
Goodwill, ending balance	199,171	201,090
FRT
Goodwill [Roll Forward]
Reduction - China divestiture		(10,660)
China Operations
Goodwill [Roll Forward]
Reduction - China divestiture	(1,117)
Probe Cards
Goodwill [Roll Forward]
Goodwill, beginning balance	178,424	178,424
Foreign currency translation	0	0
Goodwill, ending balance	177,369	178,424
Probe Cards | FRT
Goodwill [Roll Forward]
Reduction - China divestiture		0
Probe Cards | China Operations
Goodwill [Roll Forward]
Reduction - China divestiture	(1,055)
Systems
Goodwill [Roll Forward]
Goodwill, beginning balance	22,666	33,020
Foreign currency translation	(802)	306
Goodwill, ending balance	21,802	22,666
Systems | FRT
Goodwill [Roll Forward]
Reduction - China divestiture		$ (10,660)
Systems | China Operations
Goodwill [Roll Forward]
Reduction - China divestiture	$ (62)

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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