Loans to and Investments in Associated Companies - Asset Management Companies (Details) - Jefferies Group	Feb. 28, 2022
Monashee
Schedule of Equity Method Investments [Line Items]
Percentage of total voting securities	50.00%
Percentage of profits received from joint venture	47.50%
Oak Hill
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	15.00%