Regulatory Requirements (Details) - USD ($) $ in Thousands	Aug. 31, 2024	Nov. 30, 2023
Net Capital Requirements [Line Items]
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	$ 1,360,324	$ 1,414,593
Jefferies LLC
Net Capital Requirements [Line Items]
Net Capital	1,754,381
Excess Net Capital	1,640,845
JFSI - SEC
Net Capital Requirements [Line Items]
Net Capital	251,099
Excess Net Capital	227,718
JFSI - CFTC
Net Capital Requirements [Line Items]
Net Capital	251,099
Excess Net Capital	224,227
Jefferies LLC
Net Capital Requirements [Line Items]
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	658,700
Jefferies Inc
Net Capital Requirements [Line Items]
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	$ 383,200