SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2013	Dec. 29, 2012
Short-term Inventories
Raw materials and purchased parts	$ 64,261	$ 65,766
Work in process	17,537	18,075
Finished goods	26,464	24,887
Short-term inventories	108,262	108,728
Long-term Inventories
Raw materials and purchased parts	3,300	4,149
Finished goods	4,540	4,926
Long-term inventories	$ 7,840	$ 9,075