v3.25.1
NET INTEREST INCOME/EXPENSE (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Interest income:      
Interest income on trading securities $ 378,350 $ 426,428 $ 178,288
Interest income on margin loans to customers 212,360 175,571 34,558
Interest income on loans to customers 207,802 176,539 43,486
Interest income on available-for-sale securities 40,297 32,821 27,003
Interest income on reverse repurchase agreements and amounts due from banks 24,644 16,865 9,836
Interest income on held-to-maturity securities 1,000 0 0
Other interest income 0 0 1,524
Total interest income 864,453 828,224 294,695
Interest expense:      
Interest expense on securities repurchase agreement obligations 340,863 402,665 158,595
Interest expense on customer accounts and deposits 111,541 70,778 40,335
Interest expense on margin lending payable 45,748 16,990 6,635
Interest expense on debt securities issued 36,130 10,356 3,085
Interest expense on loans received 1,568 124 290
Other interest expense 45 198 7
Total interest expense 535,895 501,111 208,947
Net interest income $ 328,558 $ 327,113 $ 85,748