Mortgage Loans Held For Investment And Related Assets (Schedule Of Portfolio Balance And Related Allowance) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Apr. 30, 2014	Oct. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	$ 258,728	$ 277,423	$ 306,103
Related Allowance	9,761	11,272	12,704
Pooled (less than 60 days past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	147,614	158,496	178,497
Related Allowance	3,768	4,508	5,523
Individually (TDRs)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	40,201	43,865	47,011
Related Allowance	4,237	4,346	4,598
Individually (60 days or more past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	70,913	75,062	80,595
Related Allowance	$ 1,756	$ 2,418	$ 2,583