Mortgage Loans Held For Investment And Related Assets (Schedule Of Allowance For Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Apr. 30, 2014	Jan. 31, 2014
Mortgage Loans Held For Investment And Related Assets [Abstract]
Based on collateral value method	$ 1,663	$ 2,418	$ 2,213
Based on discounted cash flow method	4,083	4,346	4,371
Total allowance for loans	$ 5,746	$ 6,764	$ 6,584