Quarterly report pursuant to Section 13 or 15(d)

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

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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of maturity of trading and available-for-sale securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities $ 262,860 $ 216,621
Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 194,327 173,568
Non-US sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 52,413 27,016
U.S. sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 16,120 16,037
Up to 1 year    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 51,944 73,254
Up to 1 year | Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 37,704 65,415
Up to 1 year | Non-US sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 14,240 7,839
Up to 1 year | U.S. sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 0 0
1-5 years    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 109,660 56,743
1-5 years | Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 86,644 44,374
1-5 years | Non-US sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 17,884 7,310
1-5 years | U.S. sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 5,132 5,059
5-10 years    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 82,763 75,103
5-10 years | Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 59,322 59,553
5-10 years | Non-US sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 13,643 5,797
5-10 years | U.S. sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 9,798 9,753
More than 10 years    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 18,493 11,521
More than 10 years | Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 10,657 4,226
More than 10 years | Non-US sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities 6,646 6,070
More than 10 years | U.S. sovereign debt    
Debt Securities, Available-for-sale [Line Items]    
Fair value of equity securities $ 1,190 $ 1,225