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STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Dec. 29, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
STOCK-BASED COMPENSATION
Allocated Share-based Compensation Expense		$ 278	$ 123	$ 460	$ 204
Weighted average estimated fair value of stock options granted				$ 6.64	$ 3.41
CEO [Member]
STOCK-BASED COMPENSATION
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	40
Two Thousand Eighteen Equity Incentive Plan [Member]
STOCK-BASED COMPENSATION
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		663		663
Employee Stock Option [Member]
STOCK-BASED COMPENSATION
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount		$ 592		$ 592
Employee Service Share-based Compensation, Non-vested Awards, Compensation Cost Not yet Recognized, Period for Recognition				2 years 1 month 6 days
Restricted common shares
STOCK-BASED COMPENSATION
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount		$ 1,193		$ 1,193
Employee Service Share-based Compensation, Non-vested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				132
Restricted common shares | Leadership team
STOCK-BASED COMPENSATION
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				132

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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