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SHARE-BASED COMPENSATION - Summary of Stock Option and Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Jun. 28, 2020
Dec. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options converted (600)      
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation expense $ 100      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Beginning number of shares, outstanding (in shares) 652,655      
Options converted (600)      
Number of shares, outstanding (in shares) 652,055      
Ending number of shares, options exercisable 429,067     416,717
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward]        
Beginning balance of options outstanding (in dollars per share) $ 17.63      
Exercised (in dollars per share) 9.72      
Ending balance of options outstanding (in dollars per share) 17.64      
Options exercisable at end of period $ 17.24     $ 16.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Roll Forward]        
Options outstanding, weighted average remaining contractual term 6 years 9 months 18 days   7 years 1 month 6 days  
Optons exercisable, weighted average remaining contractual term 6 years 1 month 6 days   6 years 3 months 18 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Roll Forward]        
Beginning balance, intrinsic value $ 665      
Ending value, intrinsic value 1,013      
Options exercisable, aggregate intrinsic value $ 704     $ 463
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Nonvested, number of shares 222,988     235,938
Nonvested options, weighted average grant date fair value $ 18.42     $ 18.83
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation expense $ 100 $ 100    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Beginning number of shares, outstanding (in shares) 25,218      
Granted (in shares) 7,518      
Number of shares, outstanding (in shares) 30,858      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward]        
Beginning balance of options outstanding (in dollars per share) $ 16.01      
Granted (in dollars per share) 12.97      
Ending balance of options outstanding (in dollars per share) $ 15.45      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Nonvested, number of shares 30,858     25,218
Nonvested options, weighted average grant date fair value $ 15.45     $ 16.01