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Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands | Jul. 31, 2011 | Apr. 30, 2011
--- | --- | ---
Portfolio balance | $ 263,229 | $ 268,649 |
Related allowance | 80,389 | 80,849 |
Purchased From SCC [Member] | Portfolio Balance With Allowance [Member] |  |  |
Portfolio balance | 180,494 | 180,387 | [1]
All Other [Member] | Portfolio Balance With Allowance [Member] |  |  |
Portfolio balance | 27,954 | 29,027 | [1]
Portfolio Balance With Allowance [Member] |  |  |
Portfolio balance | 208,448 | 209,414 |
Purchased From SCC [Member] | Portfolio Balance With No Allowance [Member] |  |  |
Portfolio balance | 47,081 | 51,674 | [1]
All Other [Member] | Portfolio Balance With No Allowance [Member] |  |  |
Portfolio balance | 7,700 | 7,561 | [1]
Portfolio Balance With No Allowance [Member] |  |  |
Portfolio balance | 54,781 | 59,235 |
Purchased From SCC [Member] |  |  |
Portfolio balance | 227,575 | 232,061 | [1]
Related allowance | 70,964 | 71,733 | [1]
All Other [Member] |  |  |
Portfolio balance | 35,654 | 36,588 | [1]
Related allowance | $ 9,425 | $ 9,116 | [1]
[1] | Classification of amounts as of April 30, 2011 have been restated to conform to the current period presentation.

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