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STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
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Apr. 25, 2025 | Oct. 01, 2024 | Nov. 06, 2018 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024 | May 13, 2024 | Oct. 02, 2023 | Jan. 31, 2020 | Mar. 07, 2018 | Mar. 10, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to outstanding stock options and RSUs |  |  |  | $ 37,200,000 |  | $ 37,200,000 |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  |  | 2 years 4 months 24 days |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  | 335,768 |  | 335,768 |  | 461,710 |  |  |  |  |
Recognized compensation expense |  |  |  | $ 4,422,000 | $ 3,585,000 | $ 13,239,000 | $ 10,901,000 |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Amount authorized and approved under share repurchase program |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |  |  |
Amount of shares repurchased |  |  |  | $ 0 | $ 10,000,000.0 | $ 3,300,000 | $ 10,000,000.0 |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  | 819,623 | 369,978 | 819,623 |  |  |  |  |  |
Average price of shares repurchased (in dollars per share) |  |  |  |  | $ 12.25 | $ 8.99 | $ 12.25 |  |  |  |  |  |
Inducement Grants |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  | 217,179 |  | 217,179 |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |
Unrecognized compensation expense related to options outstanding |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  |  | 2 years 8 months 12 days |  |  |  |  |  |  |
Awards outstanding (in shares) |  |  |  | 3,103,440 |  | 3,103,440 |  | 2,453,630 |  |  |  |  |
Recognized compensation expense |  |  |  | $ 2,600,000 | 1,900,000 | $ 8,300,000 | 6,800,000 |  |  |  |  |  |
Unrecognized compensation expense related to nonvested awards |  |  |  | $ 22,100,000 |  | $ 22,100,000 |  |  |  |  |  |  |
RSUs | Inducement Grants |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  |  |  | 314,988 |  | 314,988 |  |  |  |  |  |  |
Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  |  |  | 2 years |  |  |  |  |  |  |
Awards outstanding (in shares) |  |  |  | 2,111,727 |  | 2,111,727 |  | 699,458 |  |  |  |  |
Recognized compensation expense |  |  |  | $ 1,700,000 | 600,000 | $ 4,600,000 | 2,900,000 |  |  |  |  |  |
Unrecognized compensation expense related to nonvested awards |  |  |  | $ 15,100,000 |  | $ 15,100,000 |  |  |  |  |  |  |
Performance RSUs | Inducement Grants |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  |  |  | 1,186,084 |  | 1,186,084 |  |  |  |  |  |  |
Performance RSUs | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by grant date fair value | $ 3,000,000 | $ 6,400,000 |  |  |  |  |  |  |  |  |  |  |
Performance RSUs | Chief Executive Officer | Share-Based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by other than options, grants | 360,576 | 562,283 |  |  |  |  |  |  |  |  |  |  |
Performance RSUs | Chief Executive Officer | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by other than options, grants | 120,192 | 173,010 |  |  |  |  |  |  |  |  |  |  |
Service Based Restricted Stock Units | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by grant date fair value | $ 1,000,000 | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |
Service Based Restricted Stock Units | Chief Executive Officer | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by other than options, grants |  | 187,427 |  |  |  |  |  |  |  |  |  |  |
Russell 2000 PSUs | Chief Executive Officer | Share-Based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by other than options, grants | 360,576 | 185,553 |  |  |  |  |  |  |  |  |  |  |
Stock Price PSUs | Chief Executive Officer | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by other than options, grants |  | 57,093 |  |  |  |  |  |  |  |  |  |  |
Performance options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  | 717,363 |  | 717,363 |  |  |  |  |  |  |
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 | 1,000,000.0 | $ 0 | 1,000,000.0 |  |  |  |  |  |
Exercise price per share (in dollars per share) |  |  | $ 9.50 |  |  |  |  |  |  |  |  |  |
2020 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  | 5,108,000 | 9,608,000 |  |
Number of common stock reserved for future grants (in shares) |  |  |  | 3,298,745 |  | 3,298,745 |  |  |  |  |  |  |
2020 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  |  |  | 2,715,329 |  | 2,715,329 |  |  |  |  |  |  |
2020 Plan | Performance RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  |  |  | 925,643 |  | 925,643 |  |  |  |  |  |  |
Prior Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  |  | 107,903 |  |
Purchase of common stock (in shares) |  |  |  | 118,589 |  | 118,589 |  |  |  |  |  |  |
Prior Plans | RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  |  |  | 0 |  | 0 |  |  |  |  |  |  |
ESPP common stock equivalents |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  | 87,204 |  | 87,204 |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  |  |  |  |  | 912,796 |  |  |  |  |  |  |
Discount rate from market price, offering date |  |  |  |  |  | 15.00% |  |  |  |  |  |  |
Recognized compensation expense |  |  |  | $ 0 | $ 0 | $ 400,000 | $ 0 |  |  |  |  |  |
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 |  | 0 |  |  |  |  |  |  |
Director Plan | RSUs |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  | 84,527 |  | 84,527 |  |  |  |  |  |  |

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