Mortgage Loans Held For Investment And Related Assets (Schedule Of Portfolio Balance And Related Allowance) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	$ 306,103	$ 350,235	$ 385,867
Related Allowance	12,704	14,314	18,125
Pooled (less than 60 days past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	178,497	207,319	229,761
Related Allowance	5,523	5,628	6,892
Individually (TDRs)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	47,011	55,061	63,602
Related Allowance	4,598	4,924	5,972
Individually (60 days or more past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	80,595	87,855	92,504
Related Allowance	$ 2,583	$ 3,762	$ 5,261