Related Party Transactions - Summary of Interest Income, Other Revenues and Investment Income to Private Equity Related Funds (Detail) - Equity Method Investee [Member] - Equity Investments in Jefferies Capital Partners Related Funds [Member] - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2017	Feb. 29, 2016
Related Party Transaction [Line Items]
Other revenues and investment income (loss)	$ (1,298)	$ (2,648)
Service charges	$ 125	$ 129