Fair Value Disclosures - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Nov. 30, 2015	Nov. 30, 2014
Financial instruments owned:
Corporate equity securities	$ 2,027,989	$ 2,426,242
Corporate debt securities	2,893,041	3,365,042
Collateralized debt obligations	174,236	430,868
U.S. government and federal agency securities	2,645,651	2,775,541
Municipal securities	487,141	590,849
Sovereign obligations	2,659,441	2,759,511
Loans and other receivables	1,312,333	1,556,018
Derivatives	251,080	406,268
Investments at fair value	79,344	126,372
Physical commodities		62,234
Total financial instruments owned, excluding Investments at fair value based on NAV	16,522,382	18,594,443
Counterparty and Cash Collateral Netting	(4,165,446)	(4,759,345)
Cash and cash equivalents	3,510,163	4,079,968
Cash and securities segregated and on deposit for regulatory purposes	751,084	3,444,674
Securities received as collateral	0	5,418
Financial instruments sold, not yet purchased:
Corporate equity securities	1,418,933	1,985,864
Corporate debt securities	1,556,941	1,612,217
Collateralized debt obligations		4,557
U.S. government and federal agency securities	1,488,121	2,253,055
Sovereign obligations	1,342,996	1,791,085
Loans	769,408	870,975
Derivatives	208,548	363,515
Total financial instruments sold, not yet purchased	6,785,064	8,881,268
Counterparty and Cash Collateral Netting	(4,257,998)	(4,856,618)
Obligation to return securities received as collateral	0	5,418
Other secured financings	544	30,825
Embedded conversion option		693
Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	2,801,333	2,962,511
Financial instruments sold, not yet purchased:
Residential mortgage-backed securities	117
Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	1,029,239	993,306
Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	161,554	139,681
Level 1 [Member]
Financial instruments owned:
Corporate equity securities	1,853,351	2,178,837
Corporate debt securities	0	0
Collateralized debt obligations	0	0
U.S. government and federal agency securities	2,555,018	2,694,268
Municipal securities	0	0
Sovereign obligations	1,251,366	1,968,747
Loans and other receivables	0	0
Derivatives	1,037	65,145
Investments at fair value	0	0
Physical commodities		0
Total financial instruments owned, excluding Investments at fair value based on NAV	5,660,772	6,906,997
Cash and cash equivalents	3,510,163	4,079,968
Cash and securities segregated and on deposit for regulatory purposes	751,084	3,444,674
Securities received as collateral		5,418
Financial instruments sold, not yet purchased:
Corporate equity securities	1,382,377	1,911,145
Corporate debt securities	0	0
Collateralized debt obligations		0
U.S. government and federal agency securities	1,488,121	2,253,055
Sovereign obligations	837,614	1,217,075
Loans	0	0
Derivatives	364	52,778
Total financial instruments sold, not yet purchased	3,708,476	5,434,053
Obligation to return securities received as collateral		5,418
Other secured financings	0	0
Embedded conversion option		0
Level 1 [Member] \| Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	0	0
Financial instruments sold, not yet purchased:
Residential mortgage-backed securities	0
Level 1 [Member] \| Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	0	0
Level 1 [Member] \| Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	0	0
Level 2 [Member]
Financial instruments owned:
Corporate equity securities	133,732	226,441
Corporate debt securities	2,867,165	3,342,276
Collateralized debt obligations	89,144	306,218
U.S. government and federal agency securities	90,633	81,273
Municipal securities	487,141	590,849
Sovereign obligations	1,407,955	790,764
Loans and other receivables	1,123,044	1,458,760
Derivatives	4,395,704	5,046,278
Investments at fair value	26,224	73,148
Physical commodities		62,234
Total financial instruments owned, excluding Investments at fair value based on NAV	14,485,354	15,962,233
Cash and cash equivalents	0	0
Cash and securities segregated and on deposit for regulatory purposes	0	0
Securities received as collateral		0
Financial instruments sold, not yet purchased:
Corporate equity securities	36,518	74,681
Corporate debt securities	1,556,941	1,611,994
Collateralized debt obligations		4,557
U.S. government and federal agency securities	0	0
Sovereign obligations	505,382	574,010
Loans	758,939	856,525
Derivatives	4,446,639	5,117,803
Total financial instruments sold, not yet purchased	7,304,536	8,239,570
Obligation to return securities received as collateral		0
Other secured financings	0	0
Embedded conversion option		0
Level 2 [Member] \| Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	2,731,070	2,879,954
Financial instruments sold, not yet purchased:
Residential mortgage-backed securities	117
Level 2 [Member] \| Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	1,014,913	966,651
Level 2 [Member] \| Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	118,629	137,387
Level 3 [Member]
Financial instruments owned:
Corporate equity securities	40,906	20,964
Corporate debt securities	25,876	22,766
Collateralized debt obligations	85,092	124,650
U.S. government and federal agency securities	0	0
Municipal securities	0	0
Sovereign obligations	120	0
Loans and other receivables	189,289	97,258
Derivatives	19,785	54,190
Investments at fair value	53,120	53,224
Physical commodities		0
Total financial instruments owned, excluding Investments at fair value based on NAV	541,702	484,558
Cash and cash equivalents	0	0
Cash and securities segregated and on deposit for regulatory purposes	0	0
Securities received as collateral		0
Financial instruments sold, not yet purchased:
Corporate equity securities	38	38
Corporate debt securities	0	223
Collateralized debt obligations		0
U.S. government and federal agency securities	0	0
Sovereign obligations	0	0
Loans	10,469	14,450
Derivatives	19,543	49,552
Total financial instruments sold, not yet purchased	30,050	64,263
Obligation to return securities received as collateral		0
Other secured financings	544	30,825
Embedded conversion option		693
Level 3 [Member] \| Residential mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	70,263	82,557
Financial instruments sold, not yet purchased:
Residential mortgage-backed securities	0
Level 3 [Member] \| Commercial mortgage-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	14,326	26,655
Level 3 [Member] \| Other asset-backed securities [Member]
Financial instruments owned:
Mortgage- and asset-backed securities, assets	$ 42,925	$ 2,294

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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Financial Instruments, Owned, at Fair Value Excluding Investments at Net Asset Value

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Financial Instruments Sold Not Yet Purchased Collateralized Debt Obligations

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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 of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and right to receive cash collateral under master netting arrangements.

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

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Fair value of obligations arising from corporate equity sold short.

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Fair value of obligations arising from derivatives and other contracts 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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Fair value of obligations arising from foreign government debt obligations 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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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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Carrying value as of the balance sheet date of other collateralized debt obligations.

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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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