Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]
Ceded Loss And Loss Expenses Paid Not Yet Recovered		$ 56,190
Financial Guarantee
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]
Ceded Loss And Loss Expenses Paid Not Yet Recovered	$ 78,507