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Mortgage Loans Held For Investment And Related Assets (Schedule Of Allowance For Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2013 | Apr. 30, 2012
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Financing Receivable, Impaired [Line Items] |  |
Allowance for impaired loans | $ 10,586 | $ 17,303
Based On Collateral Value Method [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance for impaired loans | 5,573 | 9,551
Based On Discounted Cash Flow Method [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance for impaired loans | $ 5,013 | $ 7,752

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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