Regulatory Requirements- Narrative (Details) - USD ($) $ in Thousands	Nov. 30, 2024	Nov. 30, 2023
Net Capital Requirements [Line Items]
Amount of restricted net assets	$ 4,960,000	$ 4,670,000
Amount of restricted net assets for regulatory capital requirements	4,540,000	4,430,000
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	1,132,612	$ 1,414,593
Jefferies LLC
Net Capital Requirements [Line Items]
Net capital	2,018,251
Excess net capital	1,879,220
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	142,600
Jefferies Inc
Net Capital Requirements [Line Items]
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	581,900
Jefferies International Limited
Net Capital Requirements [Line Items]
Net capital	1,781,000
Excess net capital	$ 1,054,000