Annual report pursuant to Section 13 and 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
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 3,688,620 $ 2,412,556
Total available-for-sale securities, at fair value 216,621 239,053
Non-U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 2,409,126 1,029,857
Total available-for-sale securities, at fair value 27,016 40,162
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 1,108,870 1,269,879
Total available-for-sale securities, at fair value 173,568 191,082
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 126,103 65,741
US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 43,173 45,022
Total available-for-sale securities, at fair value 16,037 7,809
Exchange traded notes    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 1,348 $ 2,057