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REVENUE (Contract Balances) (Details) - USD ($)
Sep. 28, 2019
Dec. 29, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract assets $ 0  
Deferred contract costs 0  
Contract liabilities 15,400,000 $ 21,800,000
Wearable technology    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract liabilities 4,800,000 6,200,000
Gift Cards    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract liabilities $ 2,900,000 $ 3,800,000