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INTANGIBLE ASSETS AND GOODWILL (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 29, 2020
USD ($)
Jan. 03, 2021
USD ($)
Rate
Dec. 29, 2019
USD ($)
Dec. 30, 2018
USD ($)
Disclosure of detailed information about intangible assets [line items]        
Intangible assets   $ 289,901 $ 383,864 $ 383,864
Percentage by which unit's recoverable amount exceed its carrying amount     20.00%  
Impairments $ 94,000 $ 93,989 $ 0  
Key assumption used in estimation of unit's recoverable amount, EBITDA multiple 7 9    
Adjusted EBITDA multiple factor assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount | Rate   100.00%    
Estimated recoverable amount to be equal to carrying amount based off adjusted EBITDA   $ 30,000    
Computer software        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets   19,273   $ 26,220
Computer software | Internally-generated        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets   16,100 21,800  
Computer software, assets not yet utilized in operations        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets   $ 1,900 $ 9,900