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Restructuring Costs - Narrative (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) ft² Employee
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs | $ 0 | $ 378 | $ 0 | $ 1,717 |
Restructuring Plan 2017 |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  |  | 1,717 | $ 1,920
Restructuring Plan 2017 | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  |  | (55) | 148
Restructuring Plan 2017 | Relocation Of Machinery And Equipment And Administrative Offices |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  |  | 1,318 | 1,318
Restructuring Plan 2017 | Employee Retention, Facility Closing, And Other Closure Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs |  |  |  | $ 454 | $ 454
Restructuring Plan 2017 | United States |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Manufacturing facility square footage (in sqft) | ft² |  |  |  |  | 160
Number of positions eliminated related to restructuring (employee) | Employee |  |  |  |  | 4
Restructuring Plan 2017 | Sweden |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Number of positions eliminated related to restructuring (employee) | Employee |  |  |  |  | 6

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