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Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2013 | Apr. 30, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance With Allowance | $ 45,695 | $ 63,265
Balance With No Allowance | 107,099 | 117,275
Total Impairment Loans | 152,794 | 180,540
Related Allowance | 10,586 | 17,303
Purchased From SCC [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance With Allowance | 38,938 | 56,128
Balance With No Allowance | 88,671 | 97,591
Total Impairment Loans | 127,609 | 153,719
Related Allowance | 8,470 | 14,917
All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance With Allowance | 6,757 | 7,137
Balance With No Allowance | 18,428 | 19,684
Total Impairment Loans | 25,185 | 26,821
Related Allowance | $ 2,116 | $ 2,386

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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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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- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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