Regulatory Requirements - Net Capital and Excess Net Capital (Details) $ in Thousands	Feb. 28, 2025 USD ($)
Jefferies LLC
Net Capital Requirements [Line Items]
Net Capital	$ 1,112,504
Excess Net Capital	984,377
JFSI - SEC
Net Capital Requirements [Line Items]
Net Capital	426,334
Excess Net Capital	406,334
JFSI - CFTC
Net Capital Requirements [Line Items]
Net Capital	426,334
Excess Net Capital	$ 400,338