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Regulatory Requirements - Narrative (Details) - USD ($) $ in Thousands	Feb. 28, 2026	Nov. 30, 2025
Net Capital Requirements [Line Items]
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	$ 1,752,549	$ 917,697
Jefferies LLC
Net Capital Requirements [Line Items]
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	1,020,000
Jefferies Inc
Net Capital Requirements [Line Items]
Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations	$ 596,100

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Net Capital Requirements [Line Items]

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Cash and securities deposited in a special reserve account for the exclusive benefit of customers.

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