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EQUITY-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | May 31, 2021 | Sep. 30, 2020 | May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity-based compensation expense | $ 3,932 | $ 5,022 | $ 7,746 | $ 10,380 |  |  |
Income tax expense (benefits) related to equity-based compensation | (1,378) | 816 | (767) | 1,713 |  |  |
Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity-based compensation expense | 1,572 | 4,078 | $ 3,988 | 8,314 |  |  |
Granted, weighted average grant date fair value (in USD per share) |  |  | $ 13.07 |  |  |  |
Unrecognized compensation expense related to unvested options at end of period | 12,072 |  | $ 12,072 |  |  |  |
Period for recognition of unrecognized compensation cost |  |  | 2 years 6 months |  |  |  |
Fair value of stock options that vested | 6,822 |  | $ 10,031 |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity-based compensation expense | 2,360 | 944 | $ 3,758 | 2,066 |  |  |
Period for recognition of unrecognized compensation cost |  |  | 3 years |  |  |  |
Cost not yet recognized, amount | 21,428 |  | $ 21,428 |  |  |  |
Vested in period, fair value | $ 3,658 |  | $ 4,066 |  |  |  |
2018 Equity Incentive Award Plan | Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for grant under the plan (in shares) | 2,233,833 |  | 2,233,833 |  |  |  | 3,500,000
Additional Class A common shares added at the beginning of calendar year as percentage of common stock outstanding at end of previous year (percent) |  |  |  |  |  |  | 4.00%
2020 Equity Incentive Award Plan | Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for grant under the plan (in shares) | 1,567,739 |  | 1,567,739 |  | 3,000,000 | 1,500,000 |
Discontinued Operations, Held-for-Sale or Disposed of by Sale | Merchant Services Business |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity-based compensation expense |  | $ 755 |  | $ 1,905 |  |  |

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