Mortgage Loans Held For Investment And Related Assets (Schedule Of Portfolio Balance And Related Allowance) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jul. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	$ 268,087	$ 277,423	$ 322,454
Related Allowance	10,561	11,272	15,514
Pooled (less than 60 days past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	152,427	158,496	186,082
Related Allowance	4,242	4,508	5,734
Individually (TDRs)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	41,649	43,865	50,136
Related Allowance	4,070	4,346	4,866
Individually (60 days or more past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	74,011	75,062	86,236
Related Allowance	$ 2,249	$ 2,418	$ 4,914