Mortgage Loans Held For Investment And Related Assets (Schedule Of Portfolio Balance) (Details) (USD $) In Thousands	Jul. 31, 2011	Apr. 30, 2011
Portfolio balance	$ 553,991	$ 572,974
Related allowance	91,303	92,087
Pooled (Less Than 60 Days Past Due) [Member]
Portfolio balance	290,762	304,325
Related allowance	10,914	11,238
Individually (TDRs) [Member]
Portfolio balance	95,417	106,328
Related allowance	9,499	11,056
Individually (60 Days Or More Past Due) [Member]
Portfolio balance	167,812	162,321
Related allowance	$ 70,890	$ 69,793

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 60
-Paragraph 47
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 944
-SubTopic 310
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488

Name:	us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant