Annual report pursuant to Section 13 and 15(d)

MARGIN LENDING, BROKERAGE AND OTHER RECEIVABLES, NET - Narrative (Details)

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MARGIN LENDING, BROKERAGE AND OTHER RECEIVABLES, NET - Narrative (Details) - USD ($)
Mar. 31, 2024
Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral received, fair value $ 7,579,057,000 $ 1,418,129,000
Collateralized financings 2,516,108,000  
Total margin lending, brokerage and other receivables, net 1,660,275,000 376,329,000
Margin lending, brokerage and other receivable due from related party 0 $ 290,195,000
Brokerage and other receivables from Related party as a percentage of related party brokerage and other receivables   78.00%
Allowance for receivables $ 11,990,000 $ 12,507,000
FST Belize    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Margin lending receivables from related party as a percentage of related party margin lending receivables 0.00% 98.00%
Margin lending receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total margin lending, brokerage and other receivables, net $ 1,635,377,000 $ 361,684,000
Margin lending receivables | Collateral Pledged    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total margin lending, brokerage and other receivables, net $ 0 $ 37,100
One    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collateral, percentage 33.00%  
One | Margin lending receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total margin lending, brokerage and other receivables, net $ 399,196,000