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Organization and Operations (Details) - USD ($)
3 Months Ended 12 Months Ended
Aug. 20, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Subsidiary, Sale of Stock [Line Items]            
Payments of equity issuance costs       $ 0 $ 0 $ 253,000
i3Verticals, LLC            
Subsidiary, Sale of Stock [Line Items]            
Non-controlling interest, ownership interest   69.70% 69.40% 69.70% 69.40%  
Continuing Equity Owner            
Subsidiary, Sale of Stock [Line Items]            
Shareholders ownership interest   31.00%   31.00%    
Class B Common Stock | Continuing Equity Owner            
Subsidiary, Sale of Stock [Line Items]            
Shareholders ownership interest   30.30%   30.30%    
Class A Common Stock | Continuing Equity Owner            
Subsidiary, Sale of Stock [Line Items]            
Shareholders ownership interest   0.70%   0.70%    
At-the-Market Program            
Subsidiary, Sale of Stock [Line Items]            
Payments of equity issuance costs     $ 440,000   $ 440,000  
At-the-Market Program | Class A Common Stock            
Subsidiary, Sale of Stock [Line Items]            
Sale of stock number of value issued in transaction $ 125,000,000          
Shares issued (in shares)   0 722,000 0 722,000  
Net proceeds from IPO     $ 17,869,000   $ 17,869,000  
Sale of stock, remaining capacity   $ 107,131,000   $ 107,131,000