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COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2023
Sep. 30, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risk, ratio of commitments to originate loans to commitments to sell   3600.00%
MUFG Union Bank v. Axos Bank    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Accrued litigation expense $ 16.0  
General and administrative expense $ 16.0  
Loan Origination Commitments    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet, loan origination commitment   $ 3,218.3
Loan Origination Commitments | Fixed Interest Rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet, loan origination commitment   $ 99.0
Weighted average fixed interest rate on commitments to extend credit   8.44%
Loan Origination Commitments | Fixed Interest Rate | Sales commitment    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet, commitment   $ 13.2
Loan Origination Commitments | Variable Interest Rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet, loan origination commitment   $ 3,119.3