This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in trading revenue. Such unrealized (holding) gains or losses relate to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition

Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition

Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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- Definition

Sales that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

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- Definition

Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

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- Definition

This element represents [net] transfers in to and out of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

No definition available.

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- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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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			6 Months Ended	9 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	9 Months Ended			6 Months Ended	3 Months Ended		6 Months Ended	3 Months Ended		9 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended		9 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2013	Feb. 28, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013 Corporate equity securities [Member] Successor [Member]	Aug. 31, 2013 Corporate equity securities [Member] Successor [Member]	Aug. 31, 2012 Corporate equity securities [Member] Predecessor [Member]	Aug. 31, 2012 Corporate equity securities [Member] Predecessor [Member]	Feb. 28, 2013 Corporate equity securities [Member] Predecessor [Member]	Nov. 30, 2012 Corporate equity securities [Member] Predecessor [Member]	Aug. 31, 2013 Residential mortgage-backed securities [Member] Successor [Member]	Feb. 28, 2013 Residential mortgage-backed securities [Member] Predecessor [Member]	Aug. 31, 2013 Net derivatives [Member] Successor [Member]	Aug. 31, 2013 Net derivatives [Member] Successor [Member]	Feb. 28, 2013 Net derivatives [Member] Predecessor [Member]	Aug. 31, 2012 Net derivatives [Member] Predecessor [Member]	Aug. 31, 2012 Net derivatives [Member] Predecessor [Member]	Aug. 31, 2013 Loans [Member] Successor [Member]	Aug. 31, 2013 Loans [Member] Successor [Member]	Feb. 28, 2013 Loans [Member] Predecessor [Member]	Aug. 31, 2012 Loans [Member] Predecessor [Member]	Aug. 31, 2012 Loans [Member] Predecessor [Member]	Aug. 31, 2013 Other secured financing [Member] Successor [Member]	Aug. 31, 2013 Other secured financing [Member] Successor [Member]	Aug. 31, 2012 Corporate debt securities [Member] Predecessor [Member]	Aug. 31, 2012 Corporate debt securities [Member] Predecessor [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance						$ 38	$ 38	$ 12,039		$ 38	$ 38	$ 1,542		$ 10,799	$ 11,185	$ 9,188	$ 4,395	$ 9,285	$ 15,212	$ 7,398	$ 1,711		$ 10,157	$ 2,294		$ 74	$ 74
Total gains/losses (realized and unrealized)	(4,600)	(2,700)	(6,900)	(2,600)	(5,100)			(410)	38			(1,542)	25	3,899	3,453	2,648	7,342	5,064						731	731	(15)	(15)
Purchases								(11,782)					(73,846)					(389)	(14,952)	(20,221)	(1,711)		(10,157)			(59)	(59)
Sales								191					75,363						716	13,799	7,398	4,285	4,285
Settlements														(60)
Net transfers into/ (out of) Level 3																(651)	10	(2,213)							2,294
Ending Balance						38	38	38	38	38	38		1,542	14,638	14,638	11,185	11,747	11,747	976	976	7,398	4,285	4,285	3,025	3,025
Change in unrealized gains/(losses) relating to instruments still held									$ 38				$ (19)	$ (3,899)	$ (3,453)	$ 2,648	$ 6,209	$ 6,087						$ (731)	$ (731)