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SEGMENT INFORMATION (Major customers as a percentage of net sales) (Details)
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Customer A    
Disclosure of major customers [line items]    
Percentage of total net sales 16.50% 18.20%
Customer B    
Disclosure of major customers [line items]    
Percentage of total net sales 11.90% 12.40%