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Investments - Summary of Selected Financial Information for Jefferies Finance (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2025
Aug. 31, 2024
Nov. 30, 2024
Guarantor Obligations [Line Items]          
Total assets $ 69,319,709   $ 69,319,709   $ 64,360,309
Total liabilities 58,818,393   58,818,393   54,134,916
Total mezzanine equity 406   406   406
Net earnings attributable to members 242,504 $ 181,039 470,748 $ 492,118  
Financial instruments owned, at fair value 26,117,064   26,117,064   24,138,274
Other assets 3,304,448   3,304,448   3,072,302
Financial instruments sold, not yet purchased, at fair value 12,356,852   12,356,852   11,007,328
Brokers, dealers and clearing organizations 3,680,047   3,680,047   3,686,367
Customers 4,448,494   4,448,494   4,073,975
Jefferies Finance          
Guarantor Obligations [Line Items]          
Total assets 7,239,500   7,239,500   5,762,600
Total liabilities 5,867,500   5,867,500   4,415,600
Total mezzanine equity 14,300   14,300   14,400
Net earnings attributable to members 27,000 28,800 25,400 68,100  
Jefferies Finance          
Guarantor Obligations [Line Items]          
Unfunded commitment fees 300 300 900 900  
Equity method investments 678,800   678,800   666,300
Origination and syndication fee revenues 73,300 72,900 191,900 200,200  
Origination fee expenses 18,300 16,200 50,700 40,800  
CLO placement and structuring fee revenues 800 800 2,300 1,100  
Placement and referral fees 6,100 2,400 16,100 3,300  
Asset management fee revenues 0 0 7,500 0  
Underwriting fees 500 0 500 0  
Service fee revenues 24,000 $ 15,300 101,000 $ 81,000  
Jefferies Finance | Corporate Joint Venture          
Guarantor Obligations [Line Items]          
Financial instruments owned, at fair value 4,600   4,600   0
Other assets 5,300   5,300   1,900
Financial instruments sold, not yet purchased, at fair value 400   400   0
Brokers, dealers and clearing organizations 15,700   15,700   0
Customers $ 2,200   $ 2,200   $ 13,700