Annual report [Section 13 and 15(d), not S-K Item 405]

FEE AND COMMISSION INCOME AND EXPENSE - Schedule of fee and commission income and expense (Details)

v3.26.1
FEE AND COMMISSION INCOME AND EXPENSE - Schedule of fee and commission income and expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Schedule of Fee and Commission income [Line Items]      
Brokerage services $ 504,283 $ 430,136 $ 333,383
Commission income from payment processing 22,755 28,711 41,659
Agency fee income 21,419 15,616 15,872
Bank services (74,335) 13,336 25,180
Underwriting and market-making services 9,473 11,210 18,801
Other fee and commission income 6,170 6,017 5,438
Fee and commission income (including $7,680, $4,725 and $65,972 from related parties) 489,765 505,026 440,333
Agency fee expense 123,211 284,483 103,385
Brokerage services 46,036 19,846 16,587
Bank services 31,126 20,064 18,121
Exchange services 6,472 1,776 3,302
Central Depository services 1,323 707 446
Other commission expenses 10,397 19,626 12,875
Total fee and commission expense 218,565 346,502 154,716
Brokerage      
Schedule of Fee and Commission income [Line Items]      
Brokerage services 504,283 430,136 333,383
Commission income from payment processing 0 0 0
Agency fee income 0 0 0
Bank services 0 0 0
Underwriting and market-making services 9,473 11,210 18,801
Other fee and commission income 549 493 297
Fee and commission income (including $7,680, $4,725 and $65,972 from related parties) 514,305 441,839 352,481
Agency fee expense 19 0 0
Brokerage services 45,580 19,846 16,506
Bank services 6,698 4,806 2,538
Exchange services 6,303 1,546 3,133
Central Depository services 1,323 706 446
Other commission expenses 886 2,376 2,117
Total fee and commission expense 60,809 29,280 24,740
Banking      
Schedule of Fee and Commission income [Line Items]      
Brokerage services 0 0 0
Commission income from payment processing 0 0 0
Agency fee income 7 0 108
Bank services (74,335) 13,336 25,180
Underwriting and market-making services 0 0 0
Other fee and commission income 1,632 1,353 948
Fee and commission income (including $7,680, $4,725 and $65,972 from related parties) (72,696) 14,689 26,236
Agency fee expense 211 36 0
Brokerage services 295 0 2
Bank services 23,649 14,419 13,217
Exchange services 0 0 0
Central Depository services 0 0 0
Other commission expenses 0 107 0
Total fee and commission expense 24,155 14,562 13,219
Insurance      
Schedule of Fee and Commission income [Line Items]      
Brokerage services 0 0 0
Commission income from payment processing 0 0 0
Agency fee income 0 0 296
Bank services 0 0 0
Underwriting and market-making services 0 0 0
Other fee and commission income 0 0 0
Fee and commission income (including $7,680, $4,725 and $65,972 from related parties) 0 0 296
Agency fee expense 122,981 284,447 103,385
Brokerage services 2 0 3
Bank services 365 538 208
Exchange services 0 0 0
Central Depository services 0 1 0
Other commission expenses 0 22 115
Total fee and commission expense 123,348 285,008 103,711
Other      
Schedule of Fee and Commission income [Line Items]      
Brokerage services 0 0 0
Commission income from payment processing 22,755 28,711 41,659
Agency fee income 21,412 15,616 15,468
Bank services 0 0 0
Underwriting and market-making services 0 0 0
Other fee and commission income 3,989 4,171 4,193
Fee and commission income (including $7,680, $4,725 and $65,972 from related parties) 48,156 48,498 61,320
Agency fee expense 0 0 0
Brokerage services 159 0 76
Bank services 414 301 2,158
Exchange services 169 230 169
Central Depository services 0 0 0
Other commission expenses 9,511 17,121 10,643
Total fee and commission expense $ 10,253 $ 17,652 $ 13,046