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Mortgage Loans Held for Investment and Related Assets (Schedule of Credit Quality Indicators and Portfolio Balance) (Details) (USD $) In Thousands | Apr. 30, 2011 | Apr. 30, 2010
--- | --- | ---
Portfolio balance | $ 572,974 | $ 683,684
Purchased from SCC [Member] |  |
Portfolio balance | 357,814 |
Purchased from SCC [Member] | Occupancy Status, Owner Occupied [Member] |  |
Portfolio balance | 249,048 |
Purchased from SCC [Member] | Occupancy Status, Non-Owner Occupied [Member] |  |
Portfolio balance | 108,766 |
Purchased from SCC [Member] | Documentation Level, Full Documentation [Member] |  |
Portfolio balance | 108,509 |
Purchased from SCC [Member] | Documentation Level, Limited Documentation [Member] |  |
Portfolio balance | 11,146 |
Purchased from SCC [Member] | Documentation Level, Stated Income [Member] |  |
Portfolio balance | 205,485 |
Purchased from SCC [Member] | Documentation Level, No Documentation [Member] |  |
Portfolio balance | 32,674 |
Purchased from SCC [Member] | Internal Risk Rating, High [Member] |  |
Portfolio balance | 151,522 |
Purchased from SCC [Member] | Internal Risk Rating, Medium [Member] |  |
Portfolio balance | 206,292 |
All Other [Member] |  |
Portfolio balance | 215,160 |
All Other [Member] | Occupancy Status, Owner Occupied [Member] |  |
Portfolio balance | 136,380 |
All Other [Member] | Occupancy Status, Non-Owner Occupied [Member] |  |
Portfolio balance | 78,780 |
All Other [Member] | Documentation Level, Full Documentation [Member] |  |
Portfolio balance | 157,270 |
All Other [Member] | Documentation Level, Limited Documentation [Member] |  |
Portfolio balance | 23,355 |
All Other [Member] | Documentation Level, Stated Income [Member] |  |
Portfolio balance | 21,705 |
All Other [Member] | Documentation Level, No Documentation [Member] |  |
Portfolio balance | 12,830 |
All Other [Member] | Internal Risk Rating, High [Member] |  |
Portfolio balance | 357 |
All Other [Member] | Internal Risk Rating, Low [Member] |  |
Portfolio balance | 214,803 |
Occupancy Status, Owner Occupied [Member] |  |
Portfolio balance | 385,428 |
Occupancy Status, Non-Owner Occupied [Member] |  |
Portfolio balance | 187,546 |
Documentation Level, Full Documentation [Member] |  |
Portfolio balance | 265,779 |
Documentation Level, Limited Documentation [Member] |  |
Portfolio balance | 34,501 |
Documentation Level, Stated Income [Member] |  |
Portfolio balance | 227,190 |
Documentation Level, No Documentation [Member] |  |
Portfolio balance | 45,504 |
Internal Risk Rating, High [Member] |  |
Portfolio balance | 151,879 |
Internal Risk Rating, Medium [Member] |  |
Portfolio balance | 206,292 |
Internal Risk Rating, Low [Member] |  |
Portfolio balance | $ 214,803 |

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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant