Mortgage Loans Held for Investment and Related Assets (Schedule of Real Estate Owned) (Details) (USD $) In Thousands	12 Months Ended
Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Mortgage Loans Held For Investment And Related Assets
Balance, beginning of the period	$ 29,252	$ 44,533	$ 350
Additions	16,463	19,341	65,171
Sales	(21,889)	(24,308)	(9,072)
Impairments	(4,294)	(10,314)	(11,916)
Balance, end of the period	$ 19,532	$ 29,252	$ 44,533

The carrying amount of mortgage loans on real estate that were sold during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph c
-Subparagraph Schedule IV
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 29
-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration