Net Capital Requirements - Net Capital, Adjusted and Excess Net Capital (Detail) $ in Thousands |
May 31, 2016
USD ($)
|
|---|---|
| Jefferies [Member] | |
| Net Capital Requirements [Line Items] | |
| Net Capital | $ 1,252,403 |
| Excess Net Capital | 1,174,583 |
| Jefferies Execution [Member] | |
| Net Capital Requirements [Line Items] | |
| Net Capital | 6,439 |
| Excess Net Capital | $ 6,189 |