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Mortgage Loans Held for Investment and Related Assets (Information Related to Activities of Non-Performing Assets) (Details) (USD $) In Thousands | 12 Months Ended
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Apr. 30, 2011 | Apr. 30, 2010 | Apr. 30, 2009
Average impaired loans | $ 289,755 | $ 307,351 | $ 216,391
Interest income on impaired loans | 6,624 | 8,548 | 5,964
Interest income on impaired loans recognized on a cash basis on non-accrual status | 6,311 | 7,452 | 4,927
Purchased from SCC [Member] |  |  |
Average impaired loans | 252,673 |  |
Interest income on impaired loans | 5,795 |  |
Interest income on impaired loans recognized on a cash basis on non-accrual status | 5,567 |  |
All Other [Member] |  |  |
Average impaired loans | 37,082 |  |
Interest income on impaired loans | 829 |  |
Interest income on impaired loans recognized on a cash basis on non-accrual status | $ 744 |  |

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- Definition The average recorded investment 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 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (c)(1) 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=6965416&loc=d3e5258-111524 + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The interest income recognized during the time within that period that the financing receivables 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 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (c)(2) + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The interest income recognized on a cash-basis method of accounting during the time within that period that the financing receivables 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 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (c)(3) + Details
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Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration