Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Apr. 02, 2016	Jan. 02, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 640,914	$ 636,191
Accumulated depreciation	(433,722)	(425,613)
Property, plant and equipment, net	207,192	210,578
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,237	9,194
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	82,641	82,206
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	529,194	525,914
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,596	8,696
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 11,246	$ 10,181