Geographic and Significant Customer Information (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Long-lived tangible assets:
Total long-lived tangible assets	$ 46,597	$ 43,213
United States [Member]
Long-lived tangible assets:
Long-lived tangible assets	43,771	40,600
Japan [Member]
Long-lived tangible assets:
Long-lived tangible assets	107	148
South Korea [Member]
Long-lived tangible assets:
Long-lived tangible assets	476	520
All other [Member]
Long-lived tangible assets:
Long-lived tangible assets	$ 2,243	$ 1,945