Concentrations of Credit Risk, Significant Customers and Geographic Information (Tables)

12 Months Ended

Dec. 27, 2014

Segment Reporting [Abstract]

Significant external customer percent of total revenues

	Percent of Total Revenues
Significant Customer	2014			2013			2012
A		38	%		42	%		38	%
B		21	%		23	%		17	%
C		10	%		8	%		8	%

Revenue derived from the following countries

	Percent of Total Revenues
Country	2014			2013			2012
United States of America		20	%		16	%		21	%
Germany		59	%		65	%		58	%
Other		21	%		19	%		21	%