Mortgage Loans Held For Investment And Related Assets (Schedule Of Portfolio Balance And Related Allowance) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013	Jan. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	$ 291,325	$ 350,235	$ 372,139
Related Allowance	11,563	14,314	17,256
Pooled (less than 60 days past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	169,404	207,319	219,345
Related Allowance	4,979	5,628	6,670
Individually (TDRs)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	44,635	55,061	59,295
Related Allowance	4,371	4,924	5,013
Individually (60 days or more past due)
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	77,286	87,855	93,499
Related Allowance	$ 2,213	$ 3,762	$ 5,573