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Loans Held for Investment and Allowance for Credit Losses - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2024
USD ($)
deferral
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
deferral
Dec. 31, 2023
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans purchased $ 8,100.0 $ 5,900.0 $ 14,500.0 $ 10,500.0
Loans originated $ 1,700.0 $ 1,300.0 $ 3,000.0 $ 2,200.0
Threshold period for delinquent loans past due 4 days   4 days  
Past due charge-off threshold 120 days   120 days  
Number of deferrals | deferral 1   1  
Length of deferral term 1 month 1 month 1 month 1 month
Modified loans, length of remaining term, maximum     24 months  
Modified loans subsequently charged off     $ 17.1 $ 1.8
Minimum        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Proprietary credit quality score 0   0  
Weighted average term increase from modification 1 month 1 month 1 month 1 month
Maximum        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loan lending terms     60 months  
Proprietary credit quality score 100   100  
Length of deferral term     3 months  
Weighted average term increase from modification 12 months 12 months 12 months 12 months