SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Apr. 30, 2025 |
Mar. 31, 2025 |
|
| Revenue, Major Customer [Line Items] | ||||||
| Fee and commission income | $ 126,089 | $ 143,436 | $ 365,969 | $ 379,976 | ||
| Interest income on margin loans to customers | 73,937 | 61,295 | 207,040 | 153,279 | ||
| Goodwill | 49,453 | 48,217 | 49,453 | 48,217 | $ 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 | 85,555 | 77,354 | 255,094 | 213,643 | ||
| Interest income on margin loans to customers | $ 4,091 | $ 2,521 | $ 17,583 | $ 29,516 | ||
| X | ||||||||||
- Definition Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, man No definition available.
|
| X | ||||||||||
- Definition Investment Income, Interest Income on Margin Loans to Customers No definition available.
|
| X | ||||||||||
- Definition Percentage of voting equity interest acquired in business combination. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|