CUSTOMER LIABILITIES - Schedule of customer liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Interest-bearing deposits:
Term deposits	$ 1,722,313	$ 1,221,072
Non-interest-bearing accounts:
Total non-interest-bearing accounts	2,582,686	1,052,758
Total customer liabilities	4,304,999	2,273,830
Term deposits
Interest-bearing deposits:
Term deposits	$ 1,722,313	$ 1,221,072
Minimum \| Term deposits
Interest-bearing deposits:
Interest rate	0.05%	0.04%
Maximum \| Term deposits
Interest-bearing deposits:
Interest rate	18.30%	17.30%
Brokerage customers
Non-interest-bearing accounts:
Total non-interest-bearing accounts	$ 2,167,111	$ 742,902
Customer accounts
Non-interest-bearing accounts:
Total non-interest-bearing accounts	$ 415,575	$ 309,856

The average effective interest rate during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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