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Mortgage Loans Held For Investment And Related Assets (Information Related To Activities Of Non-Performing Assets) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Oct. 31, 2012 | Oct. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average impaired loans | $ 167,864 | $ 262,405
Interest income on impaired loans | 2,150 | 3,314
Interest income on impaired loans recognized on a cash basis on non-accrual status | 2,101 | 3,197
Purchased From SCC [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average impaired loans | 141,521 | 226,880
Interest income on impaired loans | 1,992 | 3,076
Interest income on impaired loans recognized on a cash basis on non-accrual status | 1,956 | 2,973
All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average impaired loans | 26,343 | 35,525
Interest income on impaired loans | 158 | 238
Interest income on impaired loans recognized on a cash basis on non-accrual status | $ 145 | $ 224

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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