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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 28, 2020 | Jun. 27, 2020 | Jun. 29, 2019 | Dec. 28, 2019
Changes in the carrying amount of goodwill |  |  |  |
Goodwill |  | $ 159,800 |  | $ 164,921
Accumulated goodwill impairment |  | (71,900) |  | (76,417)
Balance at the beginning of the period, Goodwill, net | $ 88,504 | 88,504 |  |
Foreign currency translation adjustment and other (1) |  | (590) |  |
Balance at the end of the period, Goodwill, net |  | 87,914 |  |
Decrease to goodwill from dissolution and final liquidation of GNU123 Liquidating Corporation | 4,500 |  |  |
Decrease to accumulated impairment loss on goodwill from dissolution and final liquidation of GNU123 Liquidating Corporation | $ 4,500 |  |  |
Accumulated impairment |  | 71,900 |  | $ 76,417
Intangible assets impairment losses |  | $ 0 | $ 0 |

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