Related Party Transactions (Details) (USD $) In Millions	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2011	Nov. 30, 2010	Nov. 30, 2010 USA Fund [Member]	Aug. 31, 2011 USA Fund [Member]	Nov. 30, 2010 Fund V [Member]	Aug. 31, 2011 Fund V [Member]	Aug. 12, 2010 Fund V [Member]	Feb. 28, 2011 Jefferies Loan Core LLC [Member]
Related Party Transaction [Line Items]
Aggregate investment	$ 85.0			$ 75.0			$ 10.0
Commitments funded			9.3	17.9	1.2	2.4
Equity Commitments	1,000.0							600.0
Unfunded equity commitments	392.5							291.0
Purchase commitments	166.1
Loans outstanding from employees	64.6	76.5
Funded equity commitments	$ 117.5