Quarterly report [Sections 13 or 15(d)]

INSURANCE CONTRACTS ASSETS AND LIABILITIES FROM INSURANCE ACTIVITIES - Allocation by contract type (Details)

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INSURANCE CONTRACTS ASSETS AND LIABILITIES FROM INSURANCE ACTIVITIES - Allocation by contract type (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Mar. 31, 2024
Liability for Claims and Claims Adjustment Expense [Line Items]        
Reserves for claims and claims' adjustment expenses, net of reinsurance $ 409,750 $ 403,018 $ 373,552 $ 219,661
Long-Duration        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Reserves for claims and claims' adjustment expenses, net of reinsurance 343,758   289,275  
Short-Duration        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Reserves for claims and claims' adjustment expenses, net of reinsurance $ 65,992   $ 84,277