BUSINESS SEGMENT INFORMATION (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Net sales and long-lived assets by geographic region
Sales to external customers	$ 595,346	$ 545,054	$ 479,787
Long-lived assets	82,843	89,873
United States
Net sales and long-lived assets by geographic region
Sales to external customers	243,674	240,736	233,479
Long-lived assets	42,710	36,082
Germany
Net sales and long-lived assets by geographic region
Sales to external customers	73,383	61,580	36,982
Other European countries
Net sales and long-lived assets by geographic region
Sales to external customers	78,428	72,957	65,387
Japan
Net sales and long-lived assets by geographic region
Sales to external customers	62,947	52,971	57,915
Other Pacific Rim countries
Net sales and long-lived assets by geographic region
Sales to external customers	94,313	80,731	65,449
Rest of world
Net sales and long-lived assets by geographic region
Sales to external customers	42,601	36,079	20,575
Long-lived assets	3,541	3,548
Israel
Net sales and long-lived assets by geographic region
Long-lived assets	26,690	42,042
Europe
Net sales and long-lived assets by geographic region
Long-lived assets	$ 9,902	$ 8,201