MARKETABLE SECURITIES (Details) (USD $) In Thousands, unless otherwise specified									3 Months Ended
	Mar. 29, 2014	Dec. 28, 2013	Mar. 29, 2014 Aggregate Fair Value Fair Value Measurements, Recurring basis	Dec. 28, 2013 Aggregate Fair Value Fair Value Measurements, Recurring basis	Mar. 29, 2014 Money market funds	Dec. 28, 2013 Money market funds	Mar. 29, 2014 Money market funds Aggregate Fair Value Fair Value Measurements, Recurring basis	Dec. 28, 2013 Money market funds Aggregate Fair Value Fair Value Measurements, Recurring basis	Mar. 29, 2014 Certificates of deposit Maximum	Mar. 29, 2014 Certificates of deposit Aggregate Fair Value Fair Value Measurements, Recurring basis	Dec. 28, 2013 Certificates of deposit Aggregate Fair Value Fair Value Measurements, Recurring basis
Aggregate fair value and aggregate amount of unrealized gains and losses
Marketable securities	$ 8,191	$ 8,219	$ 8,191	$ 8,219			$ 7,997	$ 8,052		$ 194	$ 167
Aggregate amount of unrealized gains	$ 63	$ 91			$ 63	$ 91
Maturity term									1 year