Mortgage Loans Held For Investment And Related Assets (Schedule Of Allowance For Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013	Jan. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Abstract]
Based on collateral value method	$ 2,213	$ 3,762	$ 5,573
Based on discounted cash flow method	4,371	4,924	5,013
Total allowance for loans	$ 6,584	$ 8,686	$ 10,586