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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Advertising (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for doubtful accounts receivable $ 0.0 $ 0.1  
Advertising expense 39.0 27.5 $ 26.5
Prepaid advertising $ 0.4 $ 1.3  
Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable uncollateralized customer obligations trading days   30 days  
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable uncollateralized customer obligations trading days   90 days