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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

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