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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	Mar. 31, 2023	Jun. 30, 2022
Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0445	0.0368
Minimum | Loss rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0116	0.0061
Minimum | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0700	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	0.1739	0.1095
Maximum | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.3030	0.3500
Weighted Average | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0696	0.0537
Weighted Average | Loss rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0358	0.0265
Weighted Average | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.1972	0.1848

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