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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 | 9 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average impaired loans | $ 163,582 | $ 259,423
Interest income on impaired loans | 3,172 | 4,688
Interest income on impaired loans recognized on a cash basis on non-accrual status | 3,095 | 4,506
Purchased From SCC [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average impaired loans | 137,703 | 224,002
Interest income on impaired loans | 2,940 | 4,340
Interest income on impaired loans recognized on a cash basis on non-accrual status | 2,881 | 4,182
All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average impaired loans | 25,879 | 35,421
Interest income on impaired loans | 232 | 348
Interest income on impaired loans recognized on a cash basis on non-accrual status | $ 214 | $ 324

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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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