Property, Plant and Equipment, net (Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Apr. 03, 2020	Jan. 03, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 173,284	$ 150,897
Less: accumulated depreciation and amortization	(45,651)	(42,518)
Property, plant and equipment, net	127,633	108,379
Building and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	50,779	42,343
Information systems, office equipment and furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	12,007	10,102
Internal-use computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	17,708	16,860
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	6,072	5,414
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	12,457	13,841
Machinery and manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	68,839	57,331
Transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 5,422	$ 5,006