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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 199,196,000	$ 189,214,000	$ 189,920,000
Foreign currency translation	2,346,000	(166,000)	(706,000)
Goodwill, ending balance	212,761,000	199,196,000	189,214,000
Goodwill impairments	0
FRT GmbH
Goodwill [Roll Forward]
Goodwill, acquired during period	975,000	10,148,000
Baldwin Park
Goodwill [Roll Forward]
Goodwill, acquired during period	5,590,000
High Precision Devices, Inc.
Goodwill [Roll Forward]
Goodwill, acquired during period	4,654,000
Probe Cards
Goodwill [Roll Forward]
Goodwill, beginning balance	172,482,000	172,482,000	172,482,000
Foreign currency translation	0	0	0
Goodwill, ending balance	178,072,000	172,482,000	172,482,000
Probe Cards | FRT GmbH
Goodwill [Roll Forward]
Goodwill, acquired during period	0	0
Probe Cards | Baldwin Park
Goodwill [Roll Forward]
Goodwill, acquired during period	5,590,000
Probe Cards | High Precision Devices, Inc.
Goodwill [Roll Forward]
Goodwill, acquired during period	0
Systems
Goodwill [Roll Forward]
Goodwill, beginning balance	26,714,000	16,732,000	17,438,000
Foreign currency translation	2,346,000	(166,000)	(706,000)
Goodwill, ending balance	34,689,000	26,714,000	$ 16,732,000
Systems | FRT GmbH
Goodwill [Roll Forward]
Goodwill, acquired during period	975,000	$ 10,148,000
Systems | Baldwin Park
Goodwill [Roll Forward]
Goodwill, acquired during period	0
Systems | High Precision Devices, Inc.
Goodwill [Roll Forward]
Goodwill, acquired during period	$ 4,654,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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