Quarterly report [Sections 13 or 15(d)]

CUSTOMER LIABILITIES - Schedule of customer liabilities (Details)

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CUSTOMER LIABILITIES - Schedule of customer liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2025
Mar. 31, 2025
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts $ 4,568,387 $ 2,582,686
Customer liabilities 6,815,396 4,304,999
Term deposits    
Revenue, Major Customer [Line Items]    
Term deposits $ 2,247,009 $ 1,722,313
Term deposits | Minimum    
Revenue, Major Customer [Line Items]    
Debt securities, interest rate during period (in percent) 0.04% 0.05%
Term deposits | Maximum    
Revenue, Major Customer [Line Items]    
Debt securities, interest rate during period (in percent) 18.80% 18.30%
Brokerage customers    
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts $ 3,981,165 $ 2,167,111
Customer accounts    
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts $ 587,222 $ 415,575