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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

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