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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of valuation techniques and significant level 3 inputs used in the valuation (Details)

v3.24.0.1
TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of valuation techniques and significant level 3 inputs used in the valuation (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
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
Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) 36,918 5,138
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
Corporate debt | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 2 years 3 months
Corporate debt | Valuation Technique, Discounted Cash Flow | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) $ 16,220 $ 400
Corporate debt | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value input 0.111 0.740
Corporate debt | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 3 months  
Corporate debt | Valuation Technique, Discounted Cash Flow | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) $ 255  
Corporate debt | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value input 0.740  
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
Corporate equity | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 4 years 6 months 9 years
Corporate equity | Valuation Technique, Discounted Cash Flow | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) $ 20,022 $ 962
Corporate equity | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value input 0.130 0.588
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
Non-U.S. sovereign debt | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 11 years 11 years
Non-U.S. sovereign debt | Valuation Technique, Discounted Cash Flow | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) $ 34 $ 3,776
Non-U.S. sovereign debt | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value input 0.488 0.488
Corporate equity | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated number of years 9 years  
Corporate equity | Valuation Technique, Discounted Cash Flow | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities (including $16,220 and $556 with related parties) $ 387  
Corporate equity | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value input 0.588