Regulatory Requirements - Narrative (Details) - USD ($) $ in Thousands |
Aug. 31, 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 | $ 1,177,954 | $ 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 | 225,500 | |
| Jefferies Inc | ||
| Net Capital Requirements [Line Items] | ||
| Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations | $ 528,200 |