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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Apr. 30, 2025 | Mar. 31, 2025
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Fee and commission income | $ 132,238 | $ 121,051 | $ 239,880 | $ 236,540 |  |
Interest income on margin loans to customers | 72,814 | 40,917 | 133,103 | 91,984 |  |
Goodwill | 46,247 | 53,166 | 46,247 | 53,166 |  | $ 49,093
Astel |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,740 |
Percentage of voting interests acquired |  |  |  |  | 100.00% |
Single non-related party | Revenue benchmark | Customer concentration risk |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |
Fee and commission income | 97,214 | 71,410 | 169,539 | 136,289 |  |
Interest income on margin loans to customers | $ 4,545 | $ 7,601 | $ 13,492 | $ 26,995 |  |

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