Property, Plant and Equipment (Schedule of property, plant and equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jan. 01, 2022
Property, Plant and Equipment [Line Items]
Cost	$ 460,192	$ 365,451
Accumulated depreciation	137,801	145,914
Net book value	322,391	219,537
Land [Member]
Property, Plant and Equipment [Line Items]
Cost	2,433	6,963
Accumulated depreciation	0	0
Net book value	2,433	6,963
Building [Member]
Property, Plant and Equipment [Line Items]
Cost	115,718	94,935
Accumulated depreciation	19,922	22,510
Net book value	95,796	72,425
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	314,065	236,779
Accumulated depreciation	99,923	107,319
Net book value	214,142	129,460
Enterprise software [Member]
Property, Plant and Equipment [Line Items]
Cost	22,840	19,900
Accumulated depreciation	14,873	11,740
Net book value	7,967	8,160
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	4,241	5,429
Accumulated depreciation	2,482	3,130
Net book value	1,759	2,299
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Cost	895	1,445
Accumulated depreciation	601	1,215
Net book value	$ 294	$ 230