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MARGIN LENDING, BROKERAGE AND OTHER RECEIVABLES, NET - Narrative (Details) $ in Thousands | Sep. 30, 2025 USD ($) customer | Mar. 31, 2025 USD ($) customer
--- | --- | ---
Schedule of Accounts, Notes, Loans and Financing Receivable [Table] |  |
Collateral received, fair value | $ 5,373,967 | $ 6,379,368
Other receivables | 3,528,382 | 3,319,145
Accounts receivable, allowance for credit loss | 16,637 | 19,256
Margin lending receivables |  |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table] |  |
Other receivables | $ 3,494,576 | $ 3,294,569
Nonrelated Party |  |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table] |  |
Number of customers with a balance exceeding ten percent | customer | 1 | 3
Collateralized financings | $ 1,578,444 | $ 3,218,277
Nonrelated Party | Margin lending receivables |  |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table] |  |
Other receivables | $ 1,179,017 | $ 2,323,461

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