DEBT AND LINES OF CREDIT (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Debt and Lines of credit
Total long-term debt	$ 71,973	$ 87,226
Current portion of long-term debt	825	3,580
Total long-term debt, less current portion	71,148	83,646
U.S. revolving line of credit expiring July 2018
Debt and Lines of credit
Total long-term debt	71,000	83,000
Israeli loans due through October 2015
Debt and Lines of credit
Total long-term debt	973	2,110
Japanese private placement bonds
Debt and Lines of credit
Total long-term debt		1,902
Japanese loans
Debt and Lines of credit
Total long-term debt		$ 214