Geographic and Significant Customer Information (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Long-lived tangible assets:
Total long-lived tangible assets	$ 42,938	$ 43,213
United States [Member]
Long-lived tangible assets:
Long-lived tangible assets	40,399	40,600
Japan [Member]
Long-lived tangible assets:
Long-lived tangible assets, other countries	125	148
South Korea [Member]
Long-lived tangible assets:
Long-lived tangible assets, other countries	465	520
Israel
Long-lived tangible assets:
Long-lived tangible assets, other countries	10	13
All other [Member]
Long-lived tangible assets:
Long-lived tangible assets, other countries	$ 1,939	$ 1,932