Mortgage Loans Held For Investment And Related Assets (Schedule Of Portfolio Balance And Related Allowance) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	$ 277,423	$ 350,235
Related Allowance	11,272	14,314
Pooled (less than 60 days past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	158,496	207,319
Related Allowance	4,508	5,628
Individually (TDRs)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	43,865	55,061
Related Allowance	4,346	4,924
Individually (60 days or more past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	75,062	87,855
Related Allowance	$ 2,418	$ 3,762