This is the principal amount outstanding for securitized loans only (across all types of loans).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6942082&loc=d3e107314-111719

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph i

-Clause 4

-Subclause a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/FIN46(R)-8

-Paragraph B11

-Subparagraph b

-Clause 6

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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

Litigation And Related Contingencies (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011	Oct. 31, 2011 Pending Or Threatened Litigation [Member]	Oct. 31, 2011 Minimum [Member] Investigations, Legal Claims And Lawsuits [Member]	Oct. 31, 2011 Maximum [Member] Investigations, Legal Claims And Lawsuits [Member]	Oct. 31, 2011 Maximum [Member] RSM McGladrey Litigation [Member]	Oct. 31, 2010 2SS Holdings, Inc. [Member]
Loss Contingencies [Line Items]
Litigation obligations accrued	$ 84.4	$ 70.6
Cash paid for acquisition							287.5
Liability for legal claims				0	104.0	41.5
Claim for severance benefits	8
Initial principal on loans securitized			50
Principal outstanding on loans securitized			$ 42