Business and Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Property, plant and equipment
Property, Plant and Equipment, Gross	$ 174,181	$ 146,674
Less accumulated depreciation	(104,896)	(91,125)
Property, Plant and Equipment, Net, Total	69,285	55,549
Land
Property, plant and equipment
Property, Plant and Equipment, Gross	105	105
Buildings and leasehold improvements
Property, plant and equipment
Property, Plant and Equipment, Gross	14,471	15,062
Machinery and equipment
Property, plant and equipment
Property, Plant and Equipment, Gross	55,913	51,640
Office equipment and furniture
Property, plant and equipment
Property, Plant and Equipment, Gross	4,095	5,280
Computer equipment and software
Property, plant and equipment
Property, Plant and Equipment, Gross	68,897	57,885
Construction in progress
Property, plant and equipment
Property, Plant and Equipment, Gross	$ 30,700	$ 16,702