Investments - Summary of Selected Financial Information for Jefferies LoanCore (Detail) - Jefferies LoanCore, LLC [Member] - USD ($) $ in Millions	Nov. 30, 2015	Nov. 30, 2014
Schedule of Equity Method Investments [Line Items]
Total assets	$ 2,069.1	$ 1,502.8
Total liabilities	1,469.8	964.5
Total equity	599.3	538.3
Our total equity balance	$ 290.7	$ 261.1