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Mortgage Loans Held for Investment and Related Assets (Schedule of Past Due Mortgage Loans) (Details) (USD $) In Thousands	Apr. 30, 2011		Apr. 30, 2010
Portfolio balance	$ 572,974		$ 683,684
Less Than 60 Days Past Due [Member]
Portfolio balance	47,621
Less Than 60 Days Past Due [Member] | Purchased from SCC [Member]
Portfolio balance	37,371
Less Than 60 Days Past Due [Member] | All Other [Member]
Portfolio balance	10,250
60 To 89 Days Past Due [Member]
Portfolio balance	6,476
60 To 89 Days Past Due [Member] | Purchased from SCC [Member]
Portfolio balance	4,882
60 To 89 Days Past Due [Member] | All Other [Member]
Portfolio balance	1,594
90 Days + Past Due [Member]
Portfolio balance	152,872	[1]
90 Days + Past Due [Member] | Purchased from SCC [Member]
Portfolio balance	132,326	[1]
90 Days + Past Due [Member] | All Other [Member]
Portfolio balance	20,546	[1]
Total Past Due [Member]
Portfolio balance	206,969
Total Past Due [Member] | Purchased from SCC [Member]
Portfolio balance	174,579
Total Past Due [Member] | All Other [Member]
Portfolio balance	32,390
Current [Member]
Portfolio balance	366,005
Current [Member] | Purchased from SCC [Member]
Portfolio balance	183,235
Current [Member] | All Other [Member]
Portfolio balance	182,770
Purchased from SCC [Member]
Portfolio balance	357,814
All Other [Member]
Portfolio balance	$ 215,160
[1] No loans past due 90 days or more are still accruing interest.

X

- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant