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DISCONTINUED OPERATIONS - Income (Loss) From Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Operating expenses |  |  |  |
Change in fair value of contingent consideration |  |  | $ (498) | $ 1,758
Net loss from discontinued operations attributed to non-controlling interest | $ 0 | $ (381) | (46) | (264)
Net loss from discontinued operations attributable to i3 Verticals, Inc. | 0 | (1,173) | (92) | (972)
Healthcare RCM Business | Discontinued Operations, Held-for-Sale or Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue | 0 | 9,126 | 0 | 18,862
Operating expenses |  |  |  |
Costs of services (excluding depreciation and amortization) | 0 | 5,809 | 0 | 11,530
Selling, general and administrative | 0 | 2,405 | 0 | 4,826
Depreciation and amortization | 0 | 842 | 0 | 1,665
Change in fair value of contingent consideration | 0 | 1,167 | 0 | 1,292
Total operating expenses | 0 | 10,223 | 0 | 19,313
Loss from operations | 0 | (1,097) | 0 | (451)
Other (income) expenses | 0 | (38) | 169 | (38)
Loss before income taxes from discontinued operations | 0 | (1,059) | (169) | (413)
Provision for (benefit from) income taxes | 0 | 169 | (31) | 283
Net loss from discontinued operations | 0 | (1,228) | (138) | (696)
Net loss from discontinued operations attributed to non-controlling interest | 0 | (282) | (46) | (89)
Net loss from discontinued operations attributable to i3 Verticals, Inc. | $ 0 | (946) | $ (92) | (607)
Merchant Services Business | Discontinued Operations, Held-for-Sale or Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue |  | 0 |  | 0
Operating expenses |  |  |  |
Costs of services (excluding depreciation and amortization) |  | 0 |  | 0
Selling, general and administrative |  | 0 |  | 0
Depreciation and amortization |  | 0 |  | 0
Total operating expenses |  | 0 |  | 0
Loss from operations |  | 0 |  | 0
Other (income) expenses |  | 404 |  | 657
Loss before income taxes from discontinued operations |  | (404) |  | (657)
Provision for (benefit from) income taxes |  | (78) |  | (117)
Net loss from discontinued operations |  | (326) |  | (540)
Net loss from discontinued operations attributed to non-controlling interest |  | (99) |  | (175)
Net loss from discontinued operations attributable to i3 Verticals, Inc. |  | $ (227) |  | $ (365)

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