INSURANCE CONTRACTS ASSETS AND LIABILITIES FROM INSURANCE ACTIVITIES - Allocation by Insurance Products (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses	$ 376,972	$ 223,693	$ 133,147
Reserves for claims and claims’ adjustment expenses, reinsurers’ share	3,420	4,032	1,390
Reserves for claims and claims' adjustment expenses, net of reinsurance	373,552	219,661	$ 131,757
Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses, net of reinsurance	84,277	$ 54,174
Life Insurance \| Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses	31,136
Reserves for claims and claims’ adjustment expenses, reinsurers’ share	0
Reserves for claims and claims' adjustment expenses, net of reinsurance	31,136
Accident Insurance \| Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses	12,336
Reserves for claims and claims’ adjustment expenses, reinsurers’ share	0
Reserves for claims and claims' adjustment expenses, net of reinsurance	12,336
Civil Liability \| Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses	10,137
Reserves for claims and claims’ adjustment expenses, reinsurers’ share	425
Reserves for claims and claims' adjustment expenses, net of reinsurance	9,712
Vehicle Owners \| Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses	7,457
Reserves for claims and claims’ adjustment expenses, reinsurers’ share	0
Reserves for claims and claims' adjustment expenses, net of reinsurance	7,457
Compulsory employer liability insurance \| Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses	5,572
Reserves for claims and claims’ adjustment expenses, reinsurers’ share	522
Reserves for claims and claims' adjustment expenses, net of reinsurance	5,050
Property Damage \| Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses	4,838
Reserves for claims and claims’ adjustment expenses, reinsurers’ share	296
Reserves for claims and claims' adjustment expenses, net of reinsurance	4,542
Motor Vehicle \| Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses	3,700
Reserves for claims and claims’ adjustment expenses, reinsurers’ share	44
Reserves for claims and claims' adjustment expenses, net of reinsurance	3,656
Other \| Short-Duration
Liability for Claims and Claims Adjustment Expense [Line Items]
Reserves for claims and claims' adjustment expenses, net of reinsurance	$ 10,388