Regulatory Requirements - Net Capital and Excess Net Capital (Details) $ in Thousands |
Aug. 31, 2026
USD ($)
|
|---|---|
| Jefferies LLC | |
| Net Capital Requirements [Line Items] | |
| Net Capital | $ 3,713,973 |
| Excess Net Capital | 3,485,328 |
| JFSI - SEC | |
| Net Capital Requirements [Line Items] | |
| Net Capital | 371,762 |
| Excess Net Capital | 326,827 |
| JFSI - CFTC | |
| Net Capital Requirements [Line Items] | |
| Net Capital | 371,762 |
| Excess Net Capital | 333,994 |
| JIL | |
| Net Capital Requirements [Line Items] | |
| Net Capital | 2,331,178 |
| Excess Net Capital | 1,363,033 |
| Jefferies GmbH | |
| Net Capital Requirements [Line Items] | |
| Net Capital | 394,252 |
| Excess Net Capital | $ 290,749 |