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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 |  |

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