RESTRICTED CASH - Schedule of restricted cash (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Cash and Cash Equivalents [Line Items] | ||
| Total restricted cash | $ 1,246,312 | $ 807,468 |
| Allowance for restricted cash | (15,982) | (15,153) |
| Brokerage customers' cash | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total restricted cash | 1,095,026 | 737,546 |
| Guaranty deposits | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total restricted cash | 135,258 | 70,026 |
| Short term placements | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total restricted cash | 16,368 | 0 |
| Restricted bank accounts | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total restricted cash | 9,436 | 8,122 |
| Due from banks | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total restricted cash | 6,183 | 6,904 |
| Deferred distribution payment | ||
| Cash and Cash Equivalents [Line Items] | ||
| Total restricted cash | $ 23 | $ 23 |