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Property, Plant and Equipment (Schedule of property, plant and equipment) (Details) - USD ($)
$ in Thousands
Jan. 01, 2022
Jan. 02, 2021
Property, Plant and Equipment [Line Items]    
Cost $ 365,451 $ 308,506
Accumulated depreciation 145,914 150,458
Net book value 219,537 158,048
Land [Member]    
Property, Plant and Equipment [Line Items]    
Cost 6,963 7,009
Accumulated depreciation 0 0
Net book value 6,963 7,009
Building [Member]    
Property, Plant and Equipment [Line Items]    
Cost 94,935 75,308
Accumulated depreciation 22,510 23,587
Net book value 72,425 51,721
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 236,779 191,831
Accumulated depreciation 107,319 103,092
Net book value 129,460 88,739
Enterprise software [Member]    
Property, Plant and Equipment [Line Items]    
Cost 19,900 25,250
Accumulated depreciation 11,740 16,009
Net book value 8,160 9,241
Office furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 5,429 7,258
Accumulated depreciation 3,130 6,157
Net book value 2,299 1,101
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Cost 1,445 1,850
Accumulated depreciation 1,215 1,613
Net book value $ 230 $ 237