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INCOME TAXES (Details) - USD ($)
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jun. 25, 2018
Class of Stock [Line Items]      
(Benefit from) Provision for income taxes $ 382,000 $ (228,000)  
Percent of tax benefits payable to continuing equity owners     85.00%
Tax benefits retained (percent)     15.00%
Increase in net deferred tax assets $ 0    
Period of payment to continuing equity owners 24 years    
Minimum      
Class of Stock [Line Items]      
Expected payments for repurchase of redeemable noncontrolling interest $ 0    
Maximum      
Class of Stock [Line Items]      
Expected payments for repurchase of redeemable noncontrolling interest 3,315,000    
Class B Common Stock | Continuing Equity Owner      
Class of Stock [Line Items]      
Deferred tax asset recognized 40,346,000    
Tax benefits due to continuing equity owners $ 40,832,000    
Common Stock | Class A Common Stock      
Class of Stock [Line Items]      
Redemption of common units in i3 Verticals, LLC (shares) 0 15,000  
Common Stock | Class B Common Stock      
Class of Stock [Line Items]      
Redemption of common units in i3 Verticals, LLC (shares)   (15,000)