Annual report [Section 13 and 15(d), not S-K Item 405]

CUSTOMER LIABILITIES - Schedule of customer liabilities (Details)

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CUSTOMER LIABILITIES - Schedule of customer liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Non-interest-bearing accounts:    
Total non-interest-bearing accounts $ 4,581,224 $ 2,582,686
Total customer liabilities 7,103,984 4,304,999
Term deposits    
Interest-bearing deposits:    
Term deposits $ 2,522,760 $ 1,722,313
Minimum | Term deposits    
Interest-bearing deposits:    
Interest rate 0.04% 0.05%
Maximum | Term deposits    
Interest-bearing deposits:    
Interest rate 19.40% 18.30%
Brokerage customers    
Non-interest-bearing accounts:    
Total non-interest-bearing accounts $ 3,998,521 $ 2,167,111
Customer accounts    
Non-interest-bearing accounts:    
Total non-interest-bearing accounts $ 582,703 $ 415,575