Consolidated Statements of Financial Condition (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data	May 31, 2011	Nov. 30, 2010
ASSETS
Cash and cash equivalents	$ 2,498,737	$ 2,188,998
Securities pledged to creditors	14,712,257	12,338,728
Corporate equity securities	1,713,425	1,565,793
Corporate debt securities	4,433,196	3,630,616
Mortgage- and asset-backed securities	5,187,115	4,921,565
Loans and other receivables	608,993	434,573
Derivatives	136,384	119,268
Investments, at fair value	71,033	77,784
Total financial instruments owned, at fair value	17,767,844	15,941,572
Brokers, dealers and clearing organizations	3,879,969	2,550,234
Fees, interest and other	287,655	165,603
Other assets	798,371	601,799
Total assets	40,966,534	36,726,543
LIABILITIES AND STOCKHOLDERS' EQUITY
Corporate equity securities	1,803,991	1,638,372
Corporate debt securities	2,287,160	2,375,925
Loans	165,750	171,278
Derivatives	111,406	59,552
Total financial instruments sold, not yet purchased, at fair value	11,463,263	9,109,799
Brokers, dealers and clearing organizations	3,294,826	1,885,357
Accrued expenses and other liabilities	1,203,575	1,142,850
Mandatorily redeemable preferred interest of consolidated subsidiaries	327,790	315,885
Total liabilities	37,470,160	33,915,578
STOCKHOLDERS' EQUITY
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	212,148,852	200,301,656
Treasury stock, at cost	9,994,438	28,607,510
Variable Interest Entity, Primary Beneficiary
ASSETS
Cash and cash equivalents	219,335	202,565
Corporate equity securities	181,027	120,606
Corporate debt securities	350,507	462,462
Mortgage- and asset-backed securities	42,821	43,355
Loans and other receivables	480,918	362,465
Derivatives	13,879	7,579
Investments, at fair value	2,762	15,612
Total financial instruments owned, at fair value	1,071,914	1,012,079
Brokers, dealers and clearing organizations	177,889	195,485
Fees, interest and other	6,925	127
Other assets	241	370
Total assets	1,476,304	1,410,626
LIABILITIES AND STOCKHOLDERS' EQUITY
Corporate equity securities	0	2,708
Corporate debt securities	272,876	443,100
Loans	162,285	150,100
Derivatives	0	136
Total financial instruments sold, not yet purchased, at fair value	435,161	596,044
Brokers, dealers and clearing organizations	174,175	157,134
Accrued expenses and other liabilities	125,936	94,402
Mandatorily redeemable preferred interest of consolidated subsidiaries	327,790	315,885
Total liabilities	$ 1,063,062	$ 1,163,465