v3.26.1
Investments - Summary of Selected Financial Information for Jefferies Finance (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
May 31, 2026
May 31, 2025
May 31, 2026
May 31, 2025
Nov. 30, 2025
Guarantor Obligations [Line Items]          
Interest income   $ 200   $ 1,000  
Total assets $ 79,539,946   $ 79,539,946   $ 76,012,347
Total liabilities 68,932,155   68,932,155   65,369,738
Total mezzanine equity 406   406   406
Net earnings (losses) attributable to members 249,978 91,395 409,324 228,244  
Financial instruments owned, at fair value 28,038,115   28,038,115   27,722,739
Other assets 3,531,359   3,531,359   3,246,706
Financial instruments sold, not yet purchased, at fair value 14,547,022   14,547,022   13,320,152
Brokers, dealers and clearing organizations 6,385,622   6,385,622   6,955,100
Customers 7,122,654   7,122,654   5,216,714
Jefferies Finance          
Guarantor Obligations [Line Items]          
Total assets 6,837,600   6,837,600   7,356,100
Total liabilities 5,364,900   5,364,900   5,959,200
Total mezzanine equity 15,900   15,900   14,800
Net earnings (losses) attributable to members 35,400 100 68,500 (1,600)  
Jefferies Finance          
Guarantor Obligations [Line Items]          
Interest income 200 0 400 0  
Unfunded commitment fees 300 300 600 600  
Our total equity balance 728,500   728,500   691,000
Origination and syndication fee revenues 41,700 58,400 94,800 118,600  
Origination fee expenses 11,000 13,900 29,600 32,400  
CLO placement and structuring fee revenues 1,900 1,300 2,900 1,500  
Placement and referral fee revenues 7,500 9,400 13,800 10,000  
Asset management fee revenues 0 7,500 0 7,500  
Underwriting revenues (expenses) (200) 0 (1,100) 0  
Service fees 25,800 $ 22,700 91,400 $ 77,100  
Jefferies Finance | Corporate Joint Venture          
Guarantor Obligations [Line Items]          
Financial instruments owned, at fair value 4,100   4,100   10,900
Other assets 6,200   6,200   7,000
Financial instruments sold, not yet purchased, at fair value 1,600   1,600   400
Brokers, dealers and clearing organizations 17,700   17,700   17,200
Customers $ 5,000   $ 5,000   $ 3,300