Property, Plant and Equipment, net (Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Jul. 03, 2020	Jan. 03, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 196,495	$ 150,897
Less: accumulated depreciation and amortization	(49,521)	(42,518)
Property, plant and equipment, net	146,974	108,379
Building and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	68,223	42,343
Information systems, office equipment and furniture
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	12,524	10,102
Internal-use computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	19,059	16,860
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	6,039	5,414
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	12,947	13,841
Machinery and manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	72,096	57,331
Transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment gross	$ 5,607	$ 5,006