MARGIN LENDING, BROKERAGE AND OTHER RECEIVABLES, NET - Narrative (Details) $ in Thousands |
Mar. 31, 2026
USD ($)
|
Mar. 31, 2025
USD ($)
customer
|
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Collateral received, fair value | $ 8,595,822 | $ 6,379,368 |
| Total margin lending, brokerage and other receivables, net | 4,690,782 | 3,319,145 |
| Allowance for receivables | 19,959 | 19,256 |
| Margin lending receivables | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total margin lending, brokerage and other receivables, net | 4,632,506 | $ 3,294,569 |
| Nonrelated Party | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Number of customers with a margin lending balance exceeding ten percent | customer | 3 | |
| Collateralized financings | 4,677,913 | $ 3,218,277 |
| Nonrelated Party | Margin lending receivables | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Total margin lending, brokerage and other receivables, net | $ 3,286,545 | $ 2,323,461 |