Organization and Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Stock-based compensation expense included in the condensed consolidated statements of operations
Total stock-based compensation expense	$ 5,069	$ 4,359	$ 3,196
Income tax benefit	(1,171)	(1,046)	(607)
Net stock-based compensation expense	3,898	3,313	2,589
Cost of goods sold [Member]
Stock-based compensation expense included in the condensed consolidated statements of operations
Total stock-based compensation expense	1,263	1,397	809
Sales and marketing [Member]
Stock-based compensation expense included in the condensed consolidated statements of operations
Total stock-based compensation expense	475	380	414
Research and development [Member]
Stock-based compensation expense included in the condensed consolidated statements of operations
Total stock-based compensation expense	339	325	255
General and administrative [Member]
Stock-based compensation expense included in the condensed consolidated statements of operations
Total stock-based compensation expense	$ 2,992	$ 2,257	$ 1,718