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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 27, 2021 | Dec. 26, 2020
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 212,761 | $ 199,196
Foreign currency translation | (906) | 2,346
Goodwill, ending balance | 214,218 | 212,761
FRT GmbH |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period |  | 975
Baldwin Park |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period | 352 | 5,590
High Precision Devices, Inc. |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period | 2,011 | 4,654
Probe Cards |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 178,072 | 172,482
Foreign currency translation | 0 | 0
Goodwill, ending balance | 178,424 | 178,072
Probe Cards | FRT GmbH |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period |  | 0
Probe Cards | Baldwin Park |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period | 352 | 5,590
Probe Cards | High Precision Devices, Inc. |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period | 0 | 0
Systems |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 34,689 | 26,714
Foreign currency translation | (906) | 2,346
Goodwill, ending balance | 35,794 | 34,689
Systems | FRT GmbH |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period |  | 975
Systems | Baldwin Park |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period |  | 0
Systems | High Precision Devices, Inc. |  |
Goodwill [Roll Forward] |  |
Goodwill, acquired during period | $ 2,011 | $ 4,654

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