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SHAREHOLDERS' EQUITY - Additional Information (Details) - USD ($) shares in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense (benefit) |  | $ 1,700,000 | $ (1,200,000) |
Stock issuance costs |  | 1,000,000 |  |
Subsequent Event |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Proceeds from issuance of stock | $ 5,000,000 |  |  |
Sale of stock (in shares) | 1.2 |  |  |
Shelf Registration |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Sale of stock, authorized |  |  |  | $ 150,000,000
Prospectus Supplement |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Sale of stock, authorized |  |  |  | 50,000,000
At-The-Market |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Sale of stock, authorized |  |  |  | $ 50,000,000
Proceeds from issuance of stock |  | 33,200,000 |  |
CEO |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense (benefit) |  | $ (2,400,000) |  |

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