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ENTITY-WIDE DISCLOSURES (Major customers as a percentage of net sales) (Details)
 12 Months Ended
Jan. 03, 2021
Dec. 29, 2019
Customer A    
Disclosure of major customers [line items]    
Percentage of total net sales 13.10% 13.80%
Customer B    
Disclosure of major customers [line items]    
Percentage of total net sales 12.30% 18.60%
Customer C    
Disclosure of major customers [line items]    
Percentage of total net sales 10.40% 6.90%