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STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 04, 2019
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Jun. 24, 2019
Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation   $ 2,892 $ 121 $ 25,853 $ 384    
IPO              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Sale of stock (in usd per share)           $ 22.00  
Time-based options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options, grants in period (in shares)       1,363,822      
Stock-based compensation   1,900   $ 24,400      
Unamortized compensation cost   $ 11,300   $ 11,300      
Unamortized compensation cost, weighted average period       3 years 6 months 10 days      
Options, nonvested (in shares)   6,928,511   6,928,511     5,798,375
Time-based options granted prior to IPO              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation   $ 1,300   $ 23,700      
Performance-based options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options, grants in period (in shares)       99,788      
Unamortized compensation cost   $ 26,100   $ 26,100      
Options, nonvested (in shares)   5,777,121 5,777,121 5,777,121 5,777,121   5,795,330
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity instruments other than options, grants in period (in shares)       195,135      
Stock-based compensation   $ 900 $ 100 $ 1,200 $ 300    
Unamortized compensation cost   $ 4,300   $ 4,300      
Unamortized compensation cost, weighted average period       2 years 1 month 13 days      
2019 Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for issuance (in shares) 4,597,862            
Additional share authorized, percent of common stock outstanding 4.00%