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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 9 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
Sep. 27, 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   $ 200 $ 300    
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)      
Forfeited / Canceled (in shares)     (2,200)      
Number of shares, outstanding (in shares) 649,855   649,855      
Ending number of shares, options exercisable 442,867   442,867     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      
Forfeited / Canceled (in dollars per share)     18.60      
Ending balance of options outstanding (in dollars per share) $ 17.64   17.64      
Options exercisable at end of period $ 17.22   $ 17.22     $ 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 7 months 6 days   7 years 1 month 6 days  
Optons exercisable, weighted average remaining contractual term     5 years 10 months 24 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 $ 601   601      
Options exercisable, aggregate intrinsic value $ 420   $ 420     $ 463
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]            
Nonvested, number of shares 206,988   206,988     235,938
Nonvested options, weighted average grant date fair value $ 18.53   $ 18.53     $ 18.83
Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation expense $ 100 $ 100 $ 200 $ 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)     14,748      
Number of shares, outstanding (in shares) 36,282   36,282      
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)     13.22      
Ending balance of options outstanding (in dollars per share) $ 15.16   $ 15.16      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]            
Nonvested, number of shares 36,282   36,282     25,218
Nonvested options, weighted average grant date fair value $ 15.16   $ 15.16     $ 16.01