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Mortgage Loans Held for Investment and Related Assets (Schedule of Portfolio Balance) (Details) (USD $) In Thousands | Apr. 30, 2011 | Apr. 30, 2010
--- | --- | ---
Portfolio balance | $ 572,974 | $ 683,684
Related allowance | 92,087 | 93,535
Pooled (Less Than 60 Days Past Due) [Member] |  |
Portfolio balance | 304,325 | 372,823
Related allowance | 11,238 | 15,924
Individually (TDRs) [Member] |  |
Portfolio balance | 106,328 | 144,977
Related allowance | 11,056 | 8,915
Individually (60 Days or More Past Due) [Member] |  |
Portfolio balance | 162,321 | 165,884
Related allowance | $ 69,793 | $ 68,696

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488 + Details
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Namespace Prefix: | us-gaap
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Balance Type: | credit
Period Type: | instant

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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AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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
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Namespace Prefix: | us-gaap
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Balance Type: | debit
Period Type: | instant