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Mortgage Loans Held For Investment And Related Assets (Schedule Of Past Due Mortgage Loans) (Details) (USD $) In Thousands | Jul. 31, 2011 | Apr. 30, 2011
--- | --- | ---
Portfolio balance | $ 553,991 |  | $ 572,974
Less Than 60 Days Past Due [Member] |  |  |
Portfolio balance | 46,430 |  |
Less Than 60 Days Past Due [Member] | Purchased From SCC [Member] |  |  |
Portfolio balance | 35,960 |  |
Less Than 60 Days Past Due [Member] | All Other [Member] |  |  |
Portfolio balance | 10,470 |  |
60 To 89 Days Past Due [Member] |  |  |
Portfolio balance | 10,621 |  |
60 To 89 Days Past Due [Member] | Purchased From SCC [Member] |  |  |
Portfolio balance | 8,886 |  |
60 To 89 Days Past Due [Member] | All Other [Member] |  |  |
Portfolio balance | 1,735 |  |
90 Days + Past Due [Member] |  |  |
Portfolio balance | 154,246 | [1] |
90 Days + Past Due [Member] | Purchased From SCC [Member] |  |  |
Portfolio balance | 133,767 | [1] |
90 Days + Past Due [Member] | All Other [Member] |  |  |
Portfolio balance | 20,479 | [1] |
Total Past Due [Member] |  |  |
Portfolio balance | 211,297 |  |
Total Past Due [Member] | Purchased From SCC [Member] |  |  |
Portfolio balance | 178,613 |  |
Total Past Due [Member] | All Other [Member] |  |  |
Portfolio balance | 32,684 |  |
Current [Member] |  |  |
Portfolio balance | 342,694 |  |
Current [Member] | Purchased From SCC [Member] |  |  |
Portfolio balance | 168,082 |  |
Current [Member] | All Other [Member] |  |  |
Portfolio balance | 174,612 |  |
Purchased From SCC [Member] |  |  |
Portfolio balance | 346,695 |  |
All Other [Member] |  |  |
Portfolio balance | $ 207,296 |  |
[1] | No loans past due 90 days or more are still accruing interest

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- 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AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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