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STOCKHOLDERS’ EQUITY - Narrative (Details) |  | 12 Months Ended |  |  |  |  |  |  |  |  |
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Nov. 06, 2018 $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) shares | Oct. 02, 2023 shares | Oct. 22, 2021 shares | Jun. 15, 2021 USD ($) | Sep. 30, 2020 shares | Jan. 31, 2020 shares | Feb. 28, 2019 | Oct. 23, 2018 $ / right $ / shares shares | Mar. 07, 2018 shares | Mar. 10, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to options outstanding | $ |  | $ 20,300,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  | 2 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |
Options to purchase common stock outstanding (in shares) |  | 651,269 | 781,092 | 816,717 |  |  |  | 1,162,505 |  |  |  |  |
Recognized compensation expense | $ |  | $ 10,463,000 | $ 13,346,000 | $ 11,532,000 |  |  |  |  |  |  |  |  |
Amount authorized under share repurchase program | $ |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Amount of shares repurchased | $ |  |  | $ 14,800,000 |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 886,204 |  |  |  |  |  |  |  |  |  |
Average price of shares repurchased (in dollars per share) | $ / shares |  |  | $ 16.73 |  |  |  |  |  |  |  |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |  |  |
Percentage of common stock outstanding for acquiring person under right agreement |  |  |  |  |  |  |  |  |  | 4.90% |  |  |
Series B Junior Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of preferred share purchase right for each share of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 1 |  |
Preferred stock, share conversion ratio |  |  |  |  |  |  |  |  |  |  | 0.001 |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |
Preferred stock, purchase price per right (in dollars per right) | $ / right |  |  |  |  |  |  |  |  |  |  | 35.00 |  |
Preferred stock, redemption price per right (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |
Preferred stock, number of rights expired, redeemed or exchanged (in shares) |  |  |  |  |  | 0 |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  | 2 years 6 months |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 2,188,296 | 2,441,677 | 2,411,267 |  |  |  | 2,661,943 |  |  |  |  |
Recognized compensation expense | $ |  | $ 7,100,000 | $ 9,400,000 | $ 8,100,000 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 16,700,000 |  |  |  |  |  |  |  |  |  |  |
Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  | 1 year 8 months 12 days |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 730,393 | 919,456 | 528,724 |  |  |  | 353,556 |  |  |  |  |
Recognized compensation expense | $ |  | $ 2,700,000 | $ 3,000,000 | $ 1,300,000 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 3,400,000 |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized |  | 1 month 6 days |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 400,000 | 500,000 | 700,000 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to options outstanding | $ |  | 9,000 |  |  |  |  |  |  |  |  |  |  |
Performance Options | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock reserved for future grants (in shares) | 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 0 | 100,000 | 800,000 |  |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) | $ / shares | $ 9.50 |  |  |  |  |  |  |  |  |  |  |  |
2020 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |
Number of common stock reserved for future grants (in shares) |  | 1,425,042 |  |  |  |  |  |  |  |  |  |  |
2020 Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  | 5,108,000 |  |  |  |  |  |  |  |
2020 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 1,834,474 |  |  |  |  |  |  |  |  |  |  |
2020 Plan | Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 730,393 |  |  |  |  |  |  |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 107,903 |  |  |  |
Options to purchase common stock outstanding (in shares) |  | 434,090 |  |  |  |  |  |  |  |  |  |  |
Prior Plans | RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 94,309 |  |  |  |  |  |  |  |  |  |  |
ESPP |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Number of common stock reserved for future grants (in shares) |  | 270,876 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  | 729,124 |  |  |  |  |  |  |  |  |  |  |
Discount rate from market price offering date |  | 15.00% |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | $ |  | $ 300,000 | $ 400,000 | $ 600,000 |  |  |  |  |  |  |  |  |
Director Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000
Number of common stock reserved for future grants (in shares) |  | 0 |  |  |  |  |  |  |  |  |  |  |
Director Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Options to purchase common stock outstanding (in shares) |  | 259,513 |  |  |  |  |  |  |  |  |  |  |

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