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STOCK-BASED COMPENSATION - RSAs and PSUs (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Aug. 26, 2018
Jul. 29, 2018
Sep. 30, 2018
Oct. 01, 2017
Stock-Based Compensation        
Stock-based compensation     $ 384 $ 264
Certain employees | Restricted stock awards | 2015 Plan        
Stock-Based Compensation        
Granted 262 31,207    
Grant date fair value   $ 830    
Grant date market price $ 25.27      
Vesting period (in years)   3 years    
Certain employees | Performance stock units | 2015 Plan        
Stock-Based Compensation        
Granted 33,082      
Grant date fair value $ 1,040      
Vesting period (in years) 3 years      
Non-employee directors | Restricted stock awards | 2015 Plan        
Stock-Based Compensation        
Granted   12,414    
Grant date market price   $ 26.59