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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 25, 2018
Class of Stock [Line Items] |  |  |  |  |
Provision (benefit) for income taxes |  | $ (177) | $ 337 | $ 177 |
Percent of tax benefits payable to continuing equity owners | 85.00% |  | 85.00% |  |
Tax benefits retained (percent) |  |  |  |  | 15.00%
Purchase of common units in i3 Verticals, LLC from selling shareholder | $ 4,635 |  |  |  |
Deferred tax asset recognized | 17,230 | $ 50,773 | $ 17,230 |  |
Expected Period of Payout to Conitinuing Equity Owners |  | 24 years |  |  |
Accrued interest related to uncertain tax positions | 0 | $ 0 | 0 |  |
Accrued penalties related to uncertain tax positions | 0 | 0 | 0 |  |
Minimum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Expected Payments to Continuing Equity Owners under the Tax Receivable Agreement |  | 0 |  |  |
Maximum |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Expected Payments to Continuing Equity Owners under the Tax Receivable Agreement |  | 2,103 |  |  |
Continuing Equity Owner | Class B Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Deferred tax asset recognized | 960 | 26,736 | 960 |  |
Increase in deferred tax assets |  | 25,776 |  |  |
Tax benefits due to Continuing Equity Owners | 816 | 23,229 | $ 816 |  |
Increase in Tax Receivable Agreement liabilities |  | 22,413 |  |  |
Noncontrolling Interest |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Purchase of common units in i3 Verticals, LLC from selling shareholder | $ 4,635 |  |  |  |
Federal and State |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | $ 70,970 |  |  |

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