Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 12 Months Ended
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Property, Plant and Equipment [Line Items]      
Percentage of default probability on defaulted loans 100.00%    
Allowance for credit loss accrual percent 100.00%    
Total margin lending, brokerage and other receivables, net $ 1,660,275,000 $ 376,329,000  
Goodwill $ 52,648,000 14,192,000 $ 5,898,000
Number of reportable segments | segment 4    
Margin lending receivables      
Property, Plant and Equipment [Line Items]      
Total margin lending, brokerage and other receivables, net $ 1,635,377,000 361,684,000  
Margin lending receivables | Collateral Pledged      
Property, Plant and Equipment [Line Items]      
Total margin lending, brokerage and other receivables, net $ 0 $ 37,100  
Minimum      
Property, Plant and Equipment [Line Items]      
Useful lives of assets 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Useful lives of assets 65 years    
FST Belize | Mr. Timur Turlov      
Property, Plant and Equipment [Line Items]      
Ownership percentage, controlling interest (in percent) 100.00%