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Related Party Transactions (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Related Party Transaction [Line Items] |  |  |  |
Sale of Class A common stock in initial public offering, net |  | $ 0 | $ 8,054 | $ 0
Percent of tax benefits payable to continuing equity owners |  |  | 85.00% |
Common Stock | Class A Common Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Sale of Class A common stock in initial public offering, net | $ 8,054 |  |  |
Common Stock | Class A Common Stock | Affiliated Entity | Conversion of Related Party Debt |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Sale of Class A common stock in initial public offering, net | 924 |  |  |
Notes Payable | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Notes payable, related parties |  |  | $ 10,500 | 10,500
Related party interest expense |  |  | 952 | 1,282
Junior Subordinated Notes | Unsecured Debt | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Notes payable, related parties |  |  |  | 6,158
Related party interest expense |  |  | 457 | 632
Junior Subordinated Notes | Unsecured Debt | Affiliated Entity | Repayment of Debt |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Debt repaid with proceeds from the Company's IPO | $ 5,234 |  |  |
Continuing Equity Owner | Class B Common Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Tax benefits due to Continuing Equity Owners |  | 23,229 | 816 |
Axia Tech | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net revenue from related party |  | $ 81 | $ 53 | $ 27
i3Verticals, LLC | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest in Axia Tech (percent) |  |  | 2.00% |
Chief Executive Officer | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest in Axia Tech (percent) |  |  | 10.60% |
Chief Financial Officer | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest in Axia Tech (percent) |  |  | 0.40% |

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