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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Sep. 30, 2025 | Jun. 25, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Provision for income taxes | $ 478 | $ 2,885 | $ 1,182 | $ 3,294 |  |
Tax benefits payable to continuing equity owners (as a percent) |  |  |  |  |  | 85.00%
Tax benefits retained (percent) |  |  |  |  |  | 15.00%
Accrued expenses and other current liabilities | 20,025 |  | 20,025 |  | $ 24,525 |
Long-term tax receivable agreement obligations | 32,379 |  | $ 32,379 |  | $ 32,191 |
Period of payment to continuing equity owners |  |  | 22 years |  |  |
Minimum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Expected payments for repurchase of redeemable noncontrolling interest | 0 |  | $ 0 |  |  |
Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Expected payments for repurchase of redeemable noncontrolling interest | 5,364 |  | 5,364 |  |  |
Continuing Equity Owners | Class B Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Deferred tax asset recognized | 36,222 |  | 36,222 |  |  |
Tax benefits due to continuing equity owners | $ 32,379 |  | $ 32,379 |  |  |

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