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Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Financial Guarantee Insurance Contracts, Claim Liability [Line Items] |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  | $ 41,225
Financial Guarantee |  |
Financial Guarantee Insurance Contracts, Claim Liability [Line Items] |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered | $ 85,687 |

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