Derivative Financial Instruments - Fair Value and Related Number of Derivative Contracts Categorized by Predominant Risk Exposure (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Nov. 30, 2012
Derivatives, Fair Value [Line Items]
Fair Value, Assets	$ 1,937,833	$ 2,163,336
Fair Value, Liabilities	2,087,912	2,242,005
Counterparty/cash-collateral netting, Assets	(1,730,913)	(1,865,250)
Counterparty/cash-collateral netting, Liabilities	(1,867,215)	(2,012,878)
Total Derivative Assets per Consolidated Statement of Financial Condition	206,920	298,086
Total Derivative Liabilities per Consolidated Statement of Financial Condition	220,697	229,127
Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	805,821	927,896
Number of Contracts, Assets	32,262	67,410
Fair Value, Liabilities	915,449	1,065,788
Number of Contracts, Liabilities	32,790	90,831
Foreign exchange contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	537,752	387,325
Number of Contracts, Assets	89,195	118,958
Fair Value, Liabilities	526,944	357,277
Number of Contracts, Liabilities	87,414	116,758
Equity contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	428,877	577,964
Number of Contracts, Assets	1,892,132	1,526,127
Fair Value, Liabilities	421,858	528,979
Number of Contracts, Liabilities	2,754,124	1,396,213
Commodity contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	158,064	265,703
Number of Contracts, Assets	1,534,542	754,987
Fair Value, Liabilities	204,924	278,660
Number of Contracts, Liabilities	1,528,982	728,696
Credit contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Assets	7,319	4,448
Number of Contracts, Assets	23	13
Fair Value, Liabilities	$ 18,737	$ 11,301
Number of Contracts, Liabilities	52	40

The number of derivative instruments of a particular derivative asset or group of derivative assets held by the entity.

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The amount as of the balance sheet date of the fair value of derivative assets that in accordance with the entity's accounting policy was offset against an obligation to return cash collateral under a master netting arrangement.

+ References

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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The amount as of the balance sheet date of the fair value of derivative liabilities that in accordance with the entity's accounting policy were offset against the right to reclaim cash collateral under a master netting arrangement.

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The number of derivative instruments of a particular derivative liability or group of derivative liabilities held by the entity.

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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.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 4

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- Definition

Fair value of obligations arising from derivatives and other contracts sold short.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

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