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Regulatory Requirements - Narrative (Details) - USD ($) $ in Thousands | Feb. 28, 2026 | Nov. 30, 2025
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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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