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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jan. 02, 2021
Dec. 28, 2019
Property, Plant and Equipment [Line Items]    
Cost $ 308,506 $ 288,434
Accumulated depreciation 150,458 128,759
Net book value 158,048 159,675
Land [Member]    
Property, Plant and Equipment [Line Items]    
Cost 7,009 7,070
Accumulated depreciation 0 0
Net book value 7,009 7,070
Building [Member]    
Property, Plant and Equipment [Line Items]    
Cost 75,308 65,888
Accumulated depreciation 23,587 20,149
Net book value 51,721 45,739
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 191,831 183,175
Accumulated depreciation 103,092 89,021
Net book value 88,739 94,154
Enterprise software [Member]    
Property, Plant and Equipment [Line Items]    
Cost 25,250 23,217
Accumulated depreciation 16,009 12,386
Net book value 9,241 10,831
Office furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 7,258 7,196
Accumulated depreciation 6,157 5,706
Net book value 1,101 1,490
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Cost 1,850 1,888
Accumulated depreciation 1,613 1,497
Net book value $ 237 $ 391