Mortgage Loans Held For Investment And Related Assets (Schedule Of Portfolio Balance And Related Allowance) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	$ 350,235	$ 429,312
Related Allowance	14,314	26,540
Pooled (less than 60 days past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	207,319	248,772
Related Allowance	5,628	9,237
Individually (TDRs)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	55,061	71,949
Related Allowance	4,924	7,752
Individually (60 days or more past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	87,855	108,591
Related Allowance	$ 3,762	$ 9,551