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Cover - USD ($)
 12 Months Ended
Nov. 30, 2019
Jan. 17, 2020
May 31, 2019
Cover Page. [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Nov. 30, 2019    
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 460-1900    
Title of 12(b) Security  Common Shares, par value $1 per share    
Trading Symbol JEF    
Security Exchange Name NYSE    
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    
Entity Shell Company false    
Entity Public Float     $ 4,668,438,072
Entity Common Stock, Shares Outstanding   287,939,689  
Documents Incorporated by Reference
Certain portions of the registrant's Definitive Proxy Statement pursuant to Regulation 14A of the Securities Exchange Act of 1934 in connection with the 2020 Annual Meeting of Shareholders are incorporated by reference into Part III of this Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --11-30    
Entity Central Index Key 0000096223