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Restructuring Costs - Narrative (Details)
ft² in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
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