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Mortgage Loans Held for Investment and Related Assets (Information Related to Impaired Loans) (Details) (USD $) In Thousands | Apr. 30, 2011 | Apr. 30, 2010
--- | --- | ---
Portfolio balance | $ 268,649 | $ 310,861
Related allowance | 80,849 | 77,611
Purchased from SCC [Member] | Portfolio Balance With Allowance [Member] |  |
Portfolio balance | 190,074 |
All Other [Member] | Portfolio Balance With Allowance [Member] |  |
Portfolio balance | 19,340 |
Portfolio Balance With Allowance [Member] |  |
Portfolio balance | 209,414 | 288,309
Purchased from SCC [Member] | Portfolio Balance Without Allowance [Member] |  |
Portfolio balance | 54,000 |
All Other [Member] | Portfolio Balance Without Allowance [Member] |  |
Portfolio balance | 5,235 |
Portfolio Balance Without Allowance [Member] |  |
Portfolio balance | 59,235 | 22,552
Purchased from SCC [Member] |  |
Portfolio balance | 244,074 |
Related allowance | 75,373 |
All Other [Member] |  |
Portfolio balance | 24,575 |
Related allowance | $ 5,476 |

X
- 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 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (a)(3) + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The unpaid principal balance related to impaired financing receivables. + 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)(4) -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant