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STOCKHOLDERS’ EQUITY - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 06, 2018 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | May 13, 2024 | Oct. 02, 2023 | Sep. 30, 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 |  | $ 25,400,000 |  | $ 25,400,000 |  |  |  |  |  |  |
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) |  | 482,835 |  | 482,835 |  |  |  | 651,269 |  |  |
Recognized compensation expense |  | $ 3,585,000 | $ 2,644,000 | $ 10,901,000 | $ 7,790,000 |  |  |  |  |  |
Options granted (in shares) |  |  |  | 0 | 0 |  |  |  |  |  |
Amount authorized and approved under share repurchase program |  |  |  |  |  | $ 50,000,000.0 |  |  |  |  |
Amount of shares repurchased |  | $ 10,000,000.0 |  | $ 10,000,000.0 |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 819,623 |  | 819,623 |  |  |  |  |  |  |
Average price of shares repurchased (in dollars per share) |  | $ 12.25 |  | $ 12.25 |  |  |  |  |  |  |
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 6 months |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 2,385,346 |  | 2,385,346 |  |  |  | 2,188,296 |  |  |
Recognized compensation expense |  | $ 1,900,000 | 1,900,000 | $ 6,800,000 | 5,400,000 |  |  |  |  |  |
Unrecognized compensation expense related to nonvested awards |  | $ 19,600,000 |  | $ 19,600,000 |  |  |  |  |  |  |
Performance RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized (in years) |  |  |  | 1 year 9 months 18 days |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 879,598 |  | 879,598 |  |  |  | 730,393 |  |  |
Recognized compensation expense |  | $ 600,000 | 600,000 | $ 2,900,000 | 2,000,000.0 |  |  |  |  |  |
Unrecognized compensation expense related to nonvested awards |  | 5,800,000 |  | 5,800,000 |  |  |  |  |  |  |
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 |  | $ 1,000,000.0 | $ 0 | $ 1,000,000.0 | 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 |  | 4,500,000 |  |
Number of common stock reserved for future grants (in shares) |  | 4,435,200 |  | 4,435,200 |  |  |  |  |  |  |
2020 Plan | RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 2,218,360 |  | 2,218,360 |  |  |  |  |  |  |
2020 Plan | Performance RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Awards outstanding (in shares) |  | 879,598 |  | 879,598 |  |  |  |  |  |  |
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) |  | 265,656 |  | 265,656 |  |  |  |  |  |  |
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) |  | 270,876 |  | 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 |  |  |  | $ 200,000 | $ 200,000 |  |  |  |  |  |
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 |  | 0 |  |  |  |  |  |  |
Director Plan | RSUs |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock (in shares) |  | 166,986 |  | 166,986 |  |  |  |  |  |  |

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