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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Jun. 25, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Provision for (benefit from) income taxes | $ 3,054 |  | $ (669) | $ 3,577 | $ (1,763) |
Percent of tax benefits payable to continuing equity owners | 85.00% |  |  | 85.00% |  | 85.00%
Tax benefits retained (percent) |  |  |  |  |  | 15.00%
Continuing equity owners tax payments |  |  |  | $ (9,954) | $ 0 |
Period of payment to continuing equity owners |  |  |  | 26 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 | 3,413 |  |  | 3,413 |  |
Class B Common Stock | Continuing Equity Owners |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Increase in net deferred tax assets |  |  |  | 5,035 |  |
Tax benefit |  |  |  | 4,280 |  |
Deferred tax asset recognized | 38,119 |  |  | 38,119 |  |
Tax benefits due to continuing equity owners | $ 33,526 |  |  | $ 33,526 |  |
Common Stock | Class A Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Redemption of common units in i3 Verticals, LLC (in shares) | 813,782 | 17,577 | 40,718 | 831,359 |  |
Common Stock | Class B Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Redemption of common units in i3 Verticals, LLC (in shares) | (813,782) | (17,577) | (40,718) |  |  |

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