Quarterly report pursuant to Section 13 or 15(d)

TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of trading and available-for-sale securities (Details)

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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of trading and available-for-sale securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) $ 3,680,453 $ 2,412,556
Assets measured at fair value 202,497 239,053
Non-U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) 2,370,508 1,029,857
Assets measured at fair value 62,987 40,162
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) 1,165,732 1,269,879
Assets measured at fair value 127,402 191,082
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) 99,589 65,741
U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) 43,231 45,022
Assets measured at fair value 12,108 7,809
Exchange traded notes    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) $ 1,393 $ 2,057