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Goodwill By Reportable Segment (Details) - USD ($) $ in Thousands | Oct. 02, 2020 | Dec. 31, 2019 | Jul. 31, 2019
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 430,752 | $ 425,939 |
Accumulated impairment of goodwill | (151,229) | (151,229) |
Total | 279,523 | 274,710 | $ 44,162
Photonics |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 215,697 | 213,413 |
Accumulated impairment of goodwill | (102,461) | (102,461) |
Total | 113,236 | 110,952 |
Vision |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 162,580 | 160,086 |
Accumulated impairment of goodwill | (31,722) | (31,722) |
Total | 130,858 | 128,364 |
Precision Motion |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 52,475 | 52,440 |
Accumulated impairment of goodwill | (17,046) | (17,046) |
Total | $ 35,429 | $ 35,394 |

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