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Related Party Transactions - Related Party Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Nov. 30, 2025
Assets      
Cash and cash equivalents $ 11,963,165   $ 14,043,889
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations 1,752,549   917,697
Financial instruments owned, at fair value 28,079,458   27,722,739
Securities borrowed 7,675,862   8,295,161
Securities purchased under agreements to resell 7,784,070   8,449,107
Receivables:      
Brokers, dealers and clearing organizations 3,762,461   4,310,143
Customers 3,984,448   3,439,921
Fees, interest and other 761,369   806,324
Other assets 3,468,545   3,246,706
Total assets 74,380,490   76,012,347
Liabilities      
Financial instruments sold, not yet purchased, at fair value 14,459,138   13,320,152
Securities loaned 2,690,387   2,540,759
Securities sold under agreements to repurchase 10,380,281   12,156,737
Payables:      
Brokers, dealers and clearing organizations 5,646,053   6,955,100
Accrued expenses and other liabilities 2,533,907   3,836,709
Long-term debt 17,229,419   15,895,891
Total liabilities 63,718,356   65,369,738
Revenues      
Revenues 2,871,265 $ 2,472,864  
Interest expense 854,135 879,845  
Net revenues 2,017,130 1,593,019  
Non-interest expenses      
Compensation and benefits 1,085,890 841,127  
Technology and communications 159,858 139,475  
Business development 75,422 72,291  
Other expenses 121,640 86,558  
Total non-interest expenses 1,804,914 1,441,954  
Principal transactions      
Revenues      
Revenues 487,498 407,230  
Commissions and other fees      
Revenues      
Revenues 367,604 288,300  
Interest      
Revenues      
Revenues 813,119 845,171  
Sumitomo Mitsui Banking Corporation Agreement | Related Party      
Assets      
Cash and cash equivalents 398,415   444,506
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations 27,444   27,975
Financial instruments owned, at fair value 6,312   395
Securities borrowed 7,466   3,872
Securities purchased under agreements to resell 263,644   357,261
Receivables:      
Brokers, dealers and clearing organizations 4,240   7,752
Customers 0   206
Fees, interest and other 6,514   5,438
Other assets 9,267   6,203
Total assets 723,302   853,608
Liabilities      
Financial instruments sold, not yet purchased, at fair value 2,814   6,763
Securities loaned 89,662   620
Securities sold under agreements to repurchase 562,528   638,581
Payables:      
Brokers, dealers and clearing organizations 3,403   470
Accrued expenses and other liabilities 10,496   9,537
Long-term debt 0   0
Total liabilities 668,903   $ 655,971
Revenues      
Revenues 8,703 7,923  
Interest expense 6,948 10,871  
Net revenues 1,755 (2,948)  
Non-interest expenses      
Compensation and benefits 1,243 0  
Technology and communications 1,024 0  
Business development 9,575 4,688  
Other expenses 1,090 4  
Total non-interest expenses 12,932 4,692  
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Revolving Credit Facility | Line of credit      
Payables:      
Paydown on a credit facility 1,150,000    
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Investment banking      
Revenues      
Revenues 3,329 3,849  
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Principal transactions      
Revenues      
Revenues 326 (4,192)  
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Commissions and other fees      
Revenues      
Revenues 523 649  
Sumitomo Mitsui Banking Corporation Agreement | Related Party | Interest      
Revenues      
Revenues $ 4,525 $ 7,617