Fair Value Disclosures - Summary of Changes in Fair Value of Financial Liabilities Classified as Level 3 (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2013		Feb. 29, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total gains/losses (realized and unrealized)	$ (2,700)		$ (1,500)
Corporate equity securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	38
Total gains/losses (realized and unrealized)		[1]		[1]
Purchases
Sales			11,511
Settlements
Net transfers into/ (out of) Level 3
Ending Balance	38		11,511
Change in unrealized gains/(losses) relating to instruments still held		[1]		[1]
Residential mortgage-backed securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance
Total gains/losses (realized and unrealized)	25	[1]
Purchases	(73,846)
Sales	75,363
Settlements
Net transfers into/ (out of) Level 3
Ending Balance	1,542
Change in unrealized gains/(losses) relating to instruments still held	(19)	[1]
Net derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	9,188	[2]	9,285	[2]
Total gains/losses (realized and unrealized)	2,648	[1],[2]	1,512	[1],[2]
Purchases		[2]	(295)	[2]
Sales		[2]		[2]
Settlements		[2]		[2]
Net transfers into/ (out of) Level 3	(651)	[2]	(2,192)	[2]
Ending Balance	11,185	[2]	8,310	[2]
Change in unrealized gains/(losses) relating to instruments still held	2,648	[1],[2]	2,736	[1],[2]
Loans [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	1,711		10,157
Total gains/losses (realized and unrealized)		[1]		[1]
Purchases	(1,711)		(10,157)
Sales	7,398
Settlements
Net transfers into/ (out of) Level 3
Ending Balance	7,398
Change in unrealized gains/(losses) relating to instruments still held		[1]		[1]
Corporate debt securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			74
Total gains/losses (realized and unrealized)				[1]
Purchases
Sales
Settlements
Net transfers into/ (out of) Level 3
Ending Balance			74
Change in unrealized gains/(losses) relating to instruments still held				[1]

[1] Realized and unrealized gains/losses are reported in Principal transactions in the Consolidated Statements of Earnings.

[2] Net derivatives represent Financial instruments owned - Derivatives and Financial instruments sold, not yet purchased - Derivatives.