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INTANGIBLE ASSETS AND GOODWILL (Narrative) (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Jan. 01, 2017
USD ($)
Jan. 03, 2016
USD ($)
Disclosure of detailed information about intangible assets [line items]      
Impairment identified $ 0    
Intangible assets $ 401,605,000 $ 354,221,000 $ 354,221,000
Percentage by which unit's recoverable amount exceed its carrying amount 10.00%    
Key assumption used in estimation of unit's recoverable amount, EBITDA multiple 11    
Percentage by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount 10.00%    
Adjusted EBITDA multiple factor assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount 1    
Computer software      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 17,060,000   $ 19,248,000
Computer software | Internally-generated      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 11,700,000 13,900,000  
Computer software, assets not yet utilized in operations      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets $ 5,100,000 $ 9,900,000