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Investments - Summary of Selected Financial Information for Jefferies Finance (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Nov. 30, 2025
Guarantor Obligations [Line Items]      
Total assets $ 74,380,490   $ 76,012,347
Total liabilities 63,718,356   65,369,738
Total mezzanine equity 406   406
Net earnings 159,346 $ 136,849  
Financial instruments owned, at fair value 28,079,458   27,722,739
Other assets 3,468,545   3,246,706
Financial instruments sold, not yet purchased, at fair value 14,459,138   13,320,152
Brokers, dealers and clearing organizations 5,646,053   6,955,100
Customers 5,350,833   5,216,714
Jefferies Finance      
Guarantor Obligations [Line Items]      
Total assets 6,903,700   7,356,100
Total liabilities 5,467,600   5,959,200
Total mezzanine equity 14,900   14,800
Net earnings 33,100 (1,700)  
Jefferies Finance      
Guarantor Obligations [Line Items]      
Unfunded commitment fees 300 300  
Our total equity balance 710,600   691,000
Origination and syndication fee revenues 53,100 60,200  
Origination fee expenses 18,600 18,500  
CLO placement and structuring fee revenues 1,000 200  
Placement and referral fee revenues 6,300 600  
Underwriting revenues (expenses) (1,000) 0  
Service fees 65,600 $ 54,400  
Jefferies Finance | Corporate Joint Venture      
Guarantor Obligations [Line Items]      
Financial instruments owned, at fair value 2,600   10,900
Other assets 17,000   7,000
Financial instruments sold, not yet purchased, at fair value 7,500   400
Brokers, dealers and clearing organizations 16,800   17,200
Customers $ 4,800   $ 3,300