Commitments, Contingencies and Guarantees - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Nov. 30, 2013	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2012
Loss Contingencies [Line Items]
Loan commitments outstanding to clients				$ 268.7
Fair value of mortgage-related commitments				238.6
Future minimum rentals due from non-cancelable sublease				7.1
Rent expense, net		$ 12.1	$ 43.2	57.4	$ 57.4
Gain on leaseback transaction						$ 2.0
Litigation settlement amount	$ 25.0
Litigation reserve				0.5
Fair value of derivative contracts approximated deemed to meet the definition of a guarantee				394.8
Maximum amount payable under guarantee				21.8
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit commitments				33.1
Jefferies Capital Partners LLC [Member]
Loss Contingencies [Line Items]
Outstanding equity commitments				23.6
Other Investments [Member]
Loss Contingencies [Line Items]
Outstanding equity commitments				$ 4.4