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Loans Held for Investment and Allowance for Credit Losses - Additional Information (Details)
$ in Millions
12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]      
Loans purchased $ 16,200.0 $ 12,100.0 $ 7,900.0
Loans originated $ 3,700.0 $ 3,300.0 $ 600.0
Threshold period for delinquent loans past due 4 days    
Past due charge-off threshold 120 days    
Minimum      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Loan lending terms 1 month    
Proprietary credit quality score 0    
Maximum      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Loan lending terms 60 months    
Proprietary credit quality score 100