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Cover - USD ($)
 12 Months Ended
Nov. 30, 2024
Jan. 17, 2025
May 31, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Nov. 30, 2024    
Current Fiscal Year End Date --11-30    
Document Transition Report false    
Entity File Number 1-5721    
Entity Registrant Name Jefferies Financial Group Inc.    
Entity Incorporation, State or Country Code NY    
Entity Tax Identification Number 13-2615557    
Entity Address, Address Line One 520 Madison Avenue,    
Entity Address, City or Town New York,    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10022    
City Area Code 212    
Local Phone Number 284-2300    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 8,458,821,477
Entity Common Stock, Shares Outstanding   206,094,699  
Documents Incorporated by Reference [Text Block] Certain portions of the registrant's Definitive Proxy Statement pursuant to Regulation 14A of the Securities Exchange Act of 1934 in connection with the
2025 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10-K.
    
Entity Central Index Key 0000096223    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Shares, par value $1 per share    
Trading Symbol JEF    
Security Exchange Name NYSE    
4.850% Senior Notes Due 2027      
Document Information [Line Items]      
Title of 12(b) Security 4.850% Senior Notes Due 2027    
Trading Symbol JEF 27A    
Security Exchange Name NYSE    
5.875% Senior Notes Due 2028      
Document Information [Line Items]      
Title of 12(b) Security 5.875% Senior Notes Due 2028    
Trading Symbol JEF 28    
Security Exchange Name NYSE    
2.750% Senior Notes Due 2032      
Document Information [Line Items]      
Title of 12(b) Security 2.750% Senior Notes Due 2032    
Trading Symbol JEF 32A    
Security Exchange Name NYSE    
6.200% Senior Notes Due 2034      
Document Information [Line Items]      
Title of 12(b) Security 6.200% Senior Notes Due 2034    
Trading Symbol JEF 34    
Security Exchange Name NYSE