Collateralized Transactions - Fair Value of Securities Received as Collateral (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	May 31, 2013 Successor [Member]	Nov. 30, 2012 Predecessor [Member]
Collateralized Securities Transactions [Line Items]
Fair value of collateral received	$ 1,320.3	$ 1,252.6
Rehypothecated value	549.6	727.7
Collateral received on securities for securities transactions	$ 2,257.6	$ 1,378.8

The carrying value as of the balance sheet date of securities received as collateral from a counterparty that were re-pledged, sold, delivered or otherwise reused by the entity.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729

Name:	us-gaap_CollateralSecuritiesRepledgedDeliveredOrUsed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant