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Fair Value of Financial Assets and Liabilities - Schedule of Quantitative Information About Significant Unobservable Inputs for Senior Notes and Residual Trust Certificated (Details) - Senior Notes and Residual Trust Certificates
Dec. 31, 2024
Jun. 30, 2024
Minimum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0473 0.0573
Minimum | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0117 0.0095
Minimum | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.1358 0.1240
Maximum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.3029 0.4141
Maximum | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0947 0.0698
Maximum | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.2300 0.2770
Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0684 0.0893
Weighted Average | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0753 0.0617
Weighted Average | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.2094 0.2333