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Restructuring Costs - Narrative (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 30, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 29, 2018 USD ($) Employee | Dec. 30, 2017 USD ($) ft²
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 0 | $ 770 |  |
United States |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of positions eliminated related to restructuring (employee) | Employee |  |  | 4 |
Sweden |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Number of positions eliminated related to restructuring (employee) | Employee |  |  | 6 |
Restructuring Plan 2017 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 770 |  | $ 1,920
Restructuring Plan 2017 | Employee Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  |  |  | $ 148
Restructuring Plan 2017 | Relocation Of Machinery And Equipment And Administrative Offices |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 563 | $ 1,318 |
Restructuring Plan 2017 | Employee Retention, Facility Closing, And Other Closure Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | $ 207 | $ 454 |
Restructuring Plan 2017 | United States |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Manufacturing facility square footage (in sqft) | ft² |  |  |  | 160

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