DEBT AND LINES OF CREDIT (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Debt and Lines of credit
Total long-term debt	$ 74,353	$ 87,226
Current portion of long-term debt	3,365	3,580
Total long-term debt, less current portion	70,988	83,646
U.S. revolving line of credit expiring July 2018
Debt and Lines of credit
Total long-term debt	70,500	83,000
Israeli loans due through October 2015
Debt and Lines of credit
Total long-term debt	1,735	2,110
Japanese private placement bonds due June 2014
Debt and Lines of credit
Total long-term debt	1,945	1,902
Japanese loans due through June 2016
Debt and Lines of credit
Total long-term debt	$ 173	$ 214