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Commitments and Contingencies (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 10, 2025 USD ($) trust loan | Mar. 17, 2025 USD ($) | Jul. 29, 2024 | Apr. 23, 2024 USD ($) | Dec. 16, 2022 USD ($) incentive_plan | Jun. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) | Jan. 30, 2023 USD ($) | Oct. 03, 2022 USD ($) | Apr. 18, 2022 cause | Feb. 18, 2022 advisor | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 22, 2019 USD ($) | Jun. 12, 2019 USD ($) | Jun. 03, 2019 USD ($) tranche | May 31, 2019 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental expense |  |  |  |  |  |  | $ 0 | $ 200,000 | $ 100,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Potential gross capital commitments |  |  |  |  |  |  | $ 37,000,000.0 |  | $ 37,000,000.0 |  |  | $ 41,600,000 |  |  |  |  |  |  |  |  |  |
Portfolio percentage of unfunded commitment |  |  |  |  |  |  | 95.00% |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual (release) of loss contingency related to arbitration award |  |  |  |  |  |  | $ 0 | $ 0 | $ 62,831,000 | (54,973,000) | $ 55,000,000 |  |  |  |  |  |  |  |  |  |  |
Bayati Action |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Complaint filing period |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |
Lazard Frères & Co. LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated liability |  | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional settlement accrual |  |  |  |  |  |  | 2,000,000 |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
HCLP Action | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought | $ 122,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of custody trusts | trust | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of loans in default | loan | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Arbitration Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual (release) of loss contingency related to arbitration award |  |  |  |  |  |  | 1,700,000 |  | 62,800,000 | $ (55,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Paul Capital Advisors Lawsuit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trust advisors | advisor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of new causes of action | cause |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Maximum potential negative impact |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |
Private Arbitration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive plans terminated | incentive_plan |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | $ 36,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency |  |  |  | $ 55,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal fees |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Relief motion filing period |  |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chapter 11 Cases | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum potential negative impact |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,000,000 |  |  |  |  |  |  |  |  |
Chapter 11 Cases | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum potential negative impact |  |  |  |  |  |  |  |  |  |  |  |  | 382,000,000 |  |  |  |  |  |  |  |  |
Official Committee of Bondholders Motion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum potential negative impact |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Parent Purchase of Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts under litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |
Parent Loan Trust Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts under litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,000,000
Parent Loan Trust Commitment, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, number of tranches | tranche |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Amounts under litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Parent Loan Trust Commitment, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts under litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |
Parent Capital Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts under litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 79,000,000 |  |  |  |
Parent Capital Contribution, Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts under litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 145,000,000 |  |  |  |  |
Adversary Proceeding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated liability |  |  |  |  |  |  | 34,500,000 |  | 34,500,000 |  |  | 34,500,000 |  |  |  |  |  |  |  |  |  |
Estimated insurance recoveries |  |  |  |  |  |  | $ 34,500,000 |  | $ 34,500,000 |  |  | $ 34,500,000 |  |  |  |  |  |  |  |  |  |

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