Mortgage Loans Held For Investment And Related Assets (Schedule Of Mortgage Loans Held For Investment And The Related Allowance) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Apr. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balance	$ 372,139	$ 429,312
Amount	17,256	26,540
% of Principal	4.60%
% 30+ Days Past Due	23.60%
Purchased From SCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balance	212,250
Amount	13,596
% of Principal	6.40%
% 30+ Days Past Due	34.50%
All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balance	159,889
Amount	$ 3,660
% of Principal	2.30%
% 30+ Days Past Due	9.20%