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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