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Fair Value of Financial Assets and Liabilities - Quantitative Information About Significant Unobservable Inputs for Senior Notes and Residual Trust Certificated (Details) - Senior Notes and Residual Trust Certificates	Jun. 30, 2023	Jun. 30, 2022
Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0572	0.0368
Minimum | Loss rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0125	0.0061
Minimum | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0590	0.0525
Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.2984	0.2250
Maximum | Loss rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.1496	0.1095
Maximum | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.2990	0.3500
Weighted Average (3) | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0730	0.0537
Weighted Average (3) | Loss rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0302	0.0265
Weighted Average (3) | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.1810	0.1848

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Residual Trust Certificates, Measurement Input

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