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CONTINGENT LIABILITIES (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Loss Contingencies [Line Items]      
Number of lawsuits against the company 3    
Minimum limit of per claim for providing insurance coverage on annual basis $ 5,000,000    
Maximum limit of aggregate loss incurred annually for providing insurance coverage on annual basis 10,000,000    
Total amount of damages claimed   $ 0 $ 5,400,000