Fair Value Disclosures - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	Nov. 30, 2013
Financial instruments owned:
Corporate equity securities	$ 2,609,789	$ 2,098,597
Corporate debt securities	3,260,638	2,982,768
Collateralized debt obligations	317,444	219,311
U.S. government and federal agency securities	2,236,981	2,333,610
Municipal securities	563,190	664,054
Sovereign obligations	2,629,131	2,348,488
Mortgage- and asset-backed securities, assets	5,083,832	4,473,135
Loans and other receivables	1,294,096	1,349,128
Derivatives	223,699	261,093
Investments at fair value	118,278	101,282
Physical commodities	105,982	37,888
Total financial instruments owned	18,125,616	16,650,043
Cash and cash equivalents	2,864,910	3,561,119
Investments in managed funds	71,142	57,285
Cash and securities segregated and on deposit for regulatory purposes	3,801,517	3,616,602
Securities received as collateral	1,051	11,063
Financial instruments sold, not yet purchased:
Corporate equity securities	1,601,171	1,823,299
Corporate debt securities	1,773,525	1,346,078
U.S. government and federal agency securities	2,578,965	1,324,326
Sovereign obligations	2,481,555	1,831,357
Mortgage- and asset-backed securities, liabilities	7,230	34,691
Loans	706,107	695,300
Derivatives	188,505	180,079
Physical commodities	41,545	36,483
Total financial instruments sold, not yet purchased	9,378,604	7,271,613
Obligation to return securities received as collateral	1,051	11,063
Other secured financings	50,394	39,711
Embedded conversion option	7,607	9,574
Securities purchased under agreements to resell	4,448,531	3,746,920
Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	3,501,612	3,037,760
Financial instruments sold, not yet purchased:
Mortgage- and asset-backed securities, liabilities	7,230	34,691
Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	1,227,464	1,147,978
Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	37,312	68,086
Level 1 [Member]
Financial instruments owned:
Corporate equity securities	2,197,314	1,913,220
Corporate debt securities
Collateralized debt obligations
U.S. government and federal agency securities	2,098,286	2,293,221
Municipal securities
Sovereign obligations	1,751,744	1,458,803
Loans and other receivables
Derivatives	40,304	40,952
Investments at fair value
Physical commodities
Total financial instruments owned	6,087,648	5,706,196
Cash and cash equivalents	2,864,910	3,561,119
Investments in managed funds
Cash and securities segregated and on deposit for regulatory purposes	3,801,517	3,616,602
Securities received as collateral	1,051	11,063
Financial instruments sold, not yet purchased:
Corporate equity securities	1,531,598	1,782,903
Corporate debt securities
U.S. government and federal agency securities	2,578,965	1,324,326
Sovereign obligations	1,532,087	1,360,269
Loans
Derivatives	60,012	43,829
Physical commodities
Total financial instruments sold, not yet purchased	5,702,662	4,511,327
Obligation to return securities received as collateral	1,051	11,063
Other secured financings
Embedded conversion option
Securities purchased under agreements to resell
Level 1 [Member] \| Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets
Financial instruments sold, not yet purchased:
Mortgage- and asset-backed securities, liabilities
Level 1 [Member] \| Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets
Level 1 [Member] \| Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets
Level 2 [Member]
Financial instruments owned:
Corporate equity securities	400,134	175,493
Corporate debt securities	3,231,323	2,957,102
Collateralized debt obligations	251,416	182,095
U.S. government and federal agency securities	138,695	40,389
Municipal securities	563,190	664,054
Sovereign obligations	877,387	889,685
Loans and other receivables	1,165,264	1,203,238
Derivatives	2,352,971	2,472,237
Investments at fair value	10	40
Physical commodities	105,982	37,888
Total financial instruments owned	13,715,907	12,740,374
Cash and cash equivalents
Investments in managed funds	11,614
Cash and securities segregated and on deposit for regulatory purposes
Securities received as collateral
Financial instruments sold, not yet purchased:
Corporate equity securities	68,558	40,358
Corporate debt securities	1,773,525	1,346,078
U.S. government and federal agency securities
Sovereign obligations	949,468	471,088
Loans	695,847	672,838
Derivatives	2,341,346	2,480,463
Physical commodities	41,545	36,483
Total financial instruments sold, not yet purchased	5,877,519	5,081,999
Obligation to return securities received as collateral
Other secured financings	20,000	31,000
Embedded conversion option	7,607	9,574
Securities purchased under agreements to resell
Level 2 [Member] \| Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	3,384,620	2,932,268
Financial instruments sold, not yet purchased:
Mortgage- and asset-backed securities, liabilities	7,230	34,691
Level 2 [Member] \| Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	1,209,978	1,130,410
Level 2 [Member] \| Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	34,937	55,475
Level 3 [Member]
Financial instruments owned:
Corporate equity securities	12,341	9,884
Corporate debt securities	29,315	25,666
Collateralized debt obligations	66,028	37,216
U.S. government and federal agency securities
Municipal securities
Sovereign obligations
Loans and other receivables	128,832	145,890
Derivatives	2,940	1,493
Investments at fair value	118,268	101,242
Physical commodities
Total financial instruments owned	494,577	457,062
Cash and cash equivalents
Investments in managed funds	59,528	57,285
Cash and securities segregated and on deposit for regulatory purposes
Securities received as collateral
Total Level 3 assets	554,105	514,347
Financial instruments sold, not yet purchased:
Corporate equity securities	1,015	38
Corporate debt securities
U.S. government and federal agency securities
Sovereign obligations
Loans	10,260	22,462
Derivatives	8,713	8,398
Physical commodities
Total financial instruments sold, not yet purchased	19,988	30,898
Obligation to return securities received as collateral
Other secured financings	30,394	8,711
Embedded conversion option
Securities purchased under agreements to resell
Level 3 [Member] \| Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	116,992	105,492
Financial instruments sold, not yet purchased:
Mortgage- and asset-backed securities, liabilities
Level 3 [Member] \| Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	17,486	17,568
Level 3 [Member] \| Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	2,375	12,611
Counterparty and Cash Collateral Netting [Member]
Financial instruments owned:
Corporate equity securities
Corporate debt securities
Collateralized debt obligations
U.S. government and federal agency securities
Municipal securities
Sovereign obligations
Loans and other receivables
Derivatives	(2,172,516)	(2,253,589)
Investments at fair value
Physical commodities
Total financial instruments owned	(2,172,516)	(2,253,589)
Cash and cash equivalents
Investments in managed funds
Cash and securities segregated and on deposit for regulatory purposes
Securities received as collateral
Financial instruments sold, not yet purchased:
Corporate equity securities
Corporate debt securities
U.S. government and federal agency securities
Sovereign obligations
Loans
Derivatives	(2,221,566)	(2,352,611)
Physical commodities
Total financial instruments sold, not yet purchased	(2,221,566)	(2,352,611)
Obligation to return securities received as collateral
Other secured financings
Embedded conversion option
Securities purchased under agreements to resell
Counterparty and Cash Collateral Netting [Member] \| Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets
Financial instruments sold, not yet purchased:
Mortgage- and asset-backed securities, liabilities
Counterparty and Cash Collateral Netting [Member] \| Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets
Counterparty and Cash Collateral Netting [Member] \| Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets

Fair value of loan obligations.

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The fair value as of the balance sheet date of firm holdings in structured asset - backed securities whose value and payments are derived from portfolio of fixed income underlying assets.

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The fair value as of the balance sheet date of firm holdings in corporate loans, participation certificates in GNMA project and construction loans, and escrow and trade claim receivables.

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Level 3 assets carried at fair value for which the entity bears economic exposure.

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The fair value as of the balance sheet date of the firm's investments in funds managed by us and investments in third-party managed funds in which we are entitled to a portion of the management and/or performance fees.

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No definition available.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers).

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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-SubTopic 10

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-Paragraph 4B

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The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in corporate stocks (common and preferred), stock options, warrants and any other financial instrument which represents, or provides the ability to obtain, ownership rights in a corporation. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments. Their value is derived from the values of one or more underlying assets, reference rates, or indices of asset values. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by foreign governments. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in physical commodity contracts (for example, agricultural products, metals and energy). Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in private equity, mezzanine, venture capital, merchant banking, real estate and special situations investments. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by state and local governments and authorities. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Fair value of obligations incurred from short sales.

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-Topic 940

-SubTopic 320

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-Paragraph 1

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Fair value of obligations arising from corporate debt obligations sold short.

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Fair value of obligations arising from mortgages, mortgage-backed securities and asset-backed securities sold short.

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- Definition

Fair value of obligations arising from foreign government debt obligations short.

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- Definition

Fair value of obligations arising from physical commodities sold short.

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Fair value of obligations arising from US treasury and other US government and agency debt obligations sold short.

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- Definition

The fair value of collateral received by the entity associated with securities borrowed that must be returned if the counterparty fulfills its obligations. It appears on the balance sheet as a liability and has a corresponding asset that appears on the balance sheet called Securities Received as Collateral.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15)

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-Name Statement of Financial Accounting Standard (FAS)

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-Name Accounting Standards Codification

-Glossary Collateral

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Carrying value as of the balance sheet date of other collateralized debt obligations.

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-Name Accounting Standards Codification

-Topic 942

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- Definition

The carrying value of funds outstanding loaned in the form of security resale agreements if the agreement requires the purchaser to resell the identical security purchased or a security that meets the definition of "substantially the same." Also includes purchases of participations in pools of securities that are subject to a resale agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.3)

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Article 9

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-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-08.(m)(2)(i))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Section 08

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-Subparagraph 1(i)

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-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph m

-Subparagraph 2

-Article 4

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=7472769&loc=d3e9760-107771

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-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 100

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-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 41

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The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

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-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph a(3)

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-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph a, b, c, d

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 10

-Section 05

-Paragraph 17

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-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7523297&loc=d3e113969-111729

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-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 49

-IssueDate 2006-05-01

-Chapter 4

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-Number 140

-Paragraph 91

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