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INTANGIBLE ASSETS AND GOODWILL (Narrative) (Details)
 12 Months Ended
Dec. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2017
USD ($)
Disclosure of detailed information about intangible assets [line items]      
Impairment identified $ 0    
Intangible assets $ 393,573,000 $ 401,605,000 $ 401,605,000
Key assumption used in estimation of unit's recoverable amount, EBITDA multiple 11    
Computer software      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 21,790,000   $ 17,060,000
Computer software | Internally-generated      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 0 0  
Computer software, assets not yet utilized in operations      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 5,900,000 $ 5,100,000