Cover - shares	3 Months Ended
	Feb. 29, 2024	Mar. 28, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Feb. 29, 2024
Document Transition Report	false
Entity File Number	1-05721
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 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 Central Index Key	0000096223
Current Fiscal Year End Date	--11-30
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		212,043,560
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
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