Mortgage Loans Held For Investment And Related Assets (Schedule Of Allowance For Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012
Mortgage Loans Held For Investment And Related Assets [Abstract]
Based on collateral value method	$ 2,583	$ 3,762	$ 5,261
Based on discounted cash flow method	4,598	4,924	5,972
Total allowance for loans	$ 7,181	$ 8,686	$ 11,233