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Related Party Transactions - Related Party Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2025
Aug. 31, 2024
Sep. 19, 2025
Nov. 30, 2024
Assets            
Cash and cash equivalents $ 11,458,472   $ 11,458,472     $ 12,153,414
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations 1,111,620   1,111,620     1,132,612
Financial instruments owned, at fair value 26,117,064   26,117,064     24,138,274
Securities borrowed 8,175,141   8,175,141     7,213,421
Securities purchased under agreements to resell 7,917,487   7,917,487     6,179,653
Receivables:            
Brokers, dealers and clearing organizations 2,878,285   2,878,285     2,666,591
Fees, interest and other 720,912   720,912     663,536
Other assets 3,304,448   3,304,448     3,072,302
Total assets 69,319,709   69,319,709     64,360,309
Liabilities            
Financial instruments sold, not yet purchased, at fair value 12,356,852   12,356,852     11,007,328
Securities loaned 2,498,013   2,498,013     2,540,861
Securities sold under agreements to repurchase 12,090,567   12,090,567     12,337,935
Payables:            
Brokers, dealers and clearing organizations 3,680,047   3,680,047     3,686,367
Accrued expenses and other liabilities 3,158,589   3,158,589     3,510,831
Long-term debt 16,013,634   16,013,634     13,530,565
Total liabilities 58,818,393   58,818,393     54,134,916
Revenues            
Revenues 2,907,674 $ 2,595,589 7,874,853 $ 7,663,827    
Interest expense 860,242 912,037 2,599,955 2,585,627    
Net revenues 2,047,432 1,683,552 5,274,898 5,078,200    
Non-interest expenses            
Business development 78,999 68,152 231,360 194,433    
Other expenses 60,544 43,441 217,578 168,858    
Total non-interest expenses 1,715,617 1,430,865 4,657,117 4,377,517    
Principal transactions            
Revenues            
Revenues 486,893 324,501 1,232,630 1,381,432    
Commissions and other fees            
Revenues            
Revenues 325,178 270,643 966,711 787,968    
Interest            
Revenues            
Revenues 846,894 936,786 2,570,090 2,636,002    
Sumitomo Mitsui Banking Corporation Agreement | Related Party            
Assets            
Cash and cash equivalents 352,693   352,693     542,212
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations 28,263   28,263     0
Financial instruments owned, at fair value 348   348     1,539
Securities borrowed 1,309   1,309     20,403
Securities purchased under agreements to resell 380,697   380,697     381,568
Receivables:            
Brokers, dealers and clearing organizations 0   0     3,012
Fees, interest and other 4,548   4,548     7,851
Other assets 763   763     175
Total assets 768,621   768,621     956,760
Liabilities            
Financial instruments sold, not yet purchased, at fair value 3,882   3,882     1,830
Securities loaned 3,380   3,380     187
Securities sold under agreements to repurchase 468,072   468,072     631,390
Payables:            
Brokers, dealers and clearing organizations 40,353   40,353     18,701
Accrued expenses and other liabilities 11,090   11,090     6,767
Long-term debt 350,000   350,000     0
Total liabilities 876,777   876,777     $ 658,875
Revenues            
Revenues (2,216) (33,550) 21,722 (33,550)    
Interest expense 10,811 2,411 32,527 2,411    
Net revenues (13,027) (35,961) (10,805) (35,961)    
Non-interest expenses            
Business development 11,108 4,570 22,913 4,570    
Other expenses 1 0 6 0    
Total non-interest expenses 11,109 4,570 22,919 4,570    
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Line of credit | Revolving Credit Facility | Subsequent Event            
Non-interest expenses            
Paydown on a credit facility         $ 700,000  
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Investment banking            
Revenues            
Revenues 3,114 455 11,912 455    
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Principal transactions            
Revenues            
Revenues (13,306) (38,301) (14,301) (38,301)    
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Commissions and other fees            
Revenues            
Revenues 754 180 2,155 180    
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Interest            
Revenues            
Revenues $ 7,222 $ 4,116 $ 21,956 $ 4,116