Segment, Geographic, Product and Significant Customer Information - Long-lived Tangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 28, 2015	Dec. 27, 2014
Long-lived tangible assets:
Total long-lived tangible assets	$ 47,800	$ 49,633
United States [Member]
Long-lived tangible assets:
Total long-lived tangible assets	46,011	47,729
Japan [Member]
Long-lived tangible assets:
Total long-lived tangible assets	65	71
South Korea [Member]
Long-lived tangible assets:
Total long-lived tangible assets	249	284
All other [Member]
Long-lived tangible assets:
Total long-lived tangible assets	$ 1,475	$ 1,549