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NET INTEREST INCOME/EXPENSE
 6 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
NET INTEREST INCOME/EXPENSE NET INTEREST INCOME/EXPENSE
Net interest income/expense for the three months ended September 30, 2025 and September 30, 2024 includes:
Three months ended September 30, 2025
Three months ended September 30, 2024
Interest income:
Interest income on margin loans to customers$72,814 $40,917 
Interest income on loans to customers66,678 49,393 
Interest income on trading securities37,669 104,992 
Interest income on held-to-maturity securities15,356 — 
Interest income on securities available-for-sale13,874 9,003 
Interest income on reverse repurchase agreements and amounts due from banks5,271 6,019 
Total interest income$211,662 $210,324 
Interest expense:
Interest expense on customer accounts and deposits$43,024 $23,696 
Interest expense on securities repurchase agreement obligations34,051 86,116 
Interest expense on debt securities issued17,500 6,969 
Interest expense on margin lending payable5,598 7,416 
Interest expense on loans received575 468 
Other interest expense1,511 — 
Total interest expense$102,259 $124,665 
Net interest income$109,403 $85,659 

Net interest income/expense for the six months ended September 30, 2025 and September 30, 2024 includes:
Six months ended September 30, 2025
Six months ended September 30, 2024
Interest income:
Interest income on margin loans to customers$133,103 $91,984 
Interest income on loans to customers128,372 101,760 
Interest income on trading securities90,245 212,120 
Interest income on securities available-for-sale27,257 17,403 
Interest income on held-to-maturity securities20,529 — 
Interest income on reverse repurchase agreements and amounts due from banks10,727 13,061 
Total interest income$410,233 $436,328 
Interest expense:
Interest expense on customer accounts and deposits$82,356 $46,823 
Interest expense on securities repurchase agreement obligations79,512 178,523 
Interest expense on debt securities issued31,251 13,938 
Interest expense on margin lending payable18,972 30,539 
Interest expense on loans received1,085 512 
Other interest expense2,493 48 
Total interest expense$215,669 $270,383 
Net interest income$194,564 $165,945