Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	Nov. 30, 2014
Cash and cash equivalents ($194 and $178 at February 28, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	$ 3,339,965	$ 4,079,968
Securities pledged to creditors	14,407,276	14,794,488
Financial instruments owned, at fair value, (including securities pledged of $14,407,276 and $14,794,488 at February 28, 2015 and November 30, 2014, respectively; and $65,943 and $62,990 at February 28, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	19,098,646	18,636,612
Fees, interest and other ($370 and $363 at February 28, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	276,841	262,437
Other secured financings	860,602	605,824
Accrued expenses and other liabilities ($814 and $589 at February 28, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	777,679	1,273,378
Variable Interest Entities [Member]
Cash and cash equivalents ($194 and $178 at February 28, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	194	178
Financial instruments owned, at fair value, (including securities pledged of $14,407,276 and $14,794,488 at February 28, 2015 and November 30, 2014, respectively; and $65,943 and $62,990 at February 28, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	65,943	62,990
Fees, interest and other ($370 and $363 at February 28, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	370	363
Other secured financings	854,994	597,999
Accrued expenses and other liabilities ($814 and $589 at February 28, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	$ 814	$ 589