Annual report pursuant to Section 13 and 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
Mar. 31, 2024
Mar. 31, 2023
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value $ 216,621 $ 239,053
Corporate debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 173,568 191,082
Non-U.S. sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 27,016 40,162
US sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 16,037 7,809
Up to 1 year    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 73,254 78,953
Up to 1 year | Corporate debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 65,415 77,006
Up to 1 year | Non-U.S. sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 7,839 0
Up to 1 year | US sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 0 1,947
1-5 years    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 56,743 118,527
1-5 years | Corporate debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 44,374 82,579
1-5 years | Non-U.S. sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 7,310 33,143
1-5 years | US sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 5,059 2,805
5-10 years    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 75,103 34,031
5-10 years | Corporate debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 59,553 31,486
5-10 years | Non-U.S. sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 5,797 820
5-10 years | US sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 9,753 1,725
More than 10 years    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 11,521 7,542
More than 10 years | Corporate debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 4,226 11
More than 10 years | Non-U.S. sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value 6,070 6,199
More than 10 years | US sovereign debt    
Debt Securities, Available-for-Sale [Line Items]    
Total available-for-sale securities, at fair value $ 1,225 $ 1,332