Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2011 Contract	Nov. 30, 2010 Contract
Fair value and related number of derivative contracts categorized by predominant risk exposure
Fair Value Assets	$ 2,976,897	$ 455,880
Number of contracts, Assets	2,965,206	1,312,276
Fair Value Liabilities	2,834,671	485,072
Number of contracts, Liabilities	2,726,341	1,212,083
Counterparty/cash-collateral netting, Assets	(2,451,004)	(336,612)
Counterparty/cash-collateral netting, Liabilities	(2,585,634)	(425,520)
Total Derivative Assets per Consolidated Statement of Financial Condition	525,893	119,268
Total Derivative Liabilities per Consolidated Statement of Financial Condition	249,037	59,552
Interest rate contracts [Member]
Fair value and related number of derivative contracts categorized by predominant risk exposure
Fair Value Assets	542,221	77,295
Number of contracts, Assets	63,751	41,166
Fair Value Liabilities	636,692	126,281
Number of contracts, Liabilities	66,027	43,243
Foreign exchange contracts [Member]
Fair value and related number of derivative contracts categorized by predominant risk exposure
Fair Value Assets	1,009,765	20,263
Number of contracts, Assets	102,578	1,165
Fair Value Liabilities	1,015,900	17,004
Number of contracts, Liabilities	119,780	290
Equity contracts [Member]
Fair value and related number of derivative contracts categorized by predominant risk exposure
Fair Value Assets	638,228	275,760
Number of contracts, Assets	2,364,390	1,166,365
Fair Value Liabilities	548,195	249,229
Number of contracts, Liabilities	2,119,165	1,133,464
Commodity contracts [Member]
Fair value and related number of derivative contracts categorized by predominant risk exposure
Fair Value Assets	725,927	62,727
Number of contracts, Assets	434,428	103,562
Fair Value Liabilities	598,166	76,911
Number of contracts, Liabilities	421,330	35,071
Credit contracts [Member]
Fair value and related number of derivative contracts categorized by predominant risk exposure
Fair Value Assets	60,756	19,835
Number of contracts, Assets	59	18
Fair Value Liabilities	$ 35,718	$ 15,647
Number of contracts, Liabilities	39	15

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

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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.

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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 not offset against an obligation to return cash collateral under a master netting arrangement.

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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.

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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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Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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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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