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	Oct. 31, 2012	Apr. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balance	$ 385,867	$ 429,312
Amount	18,125	26,540
% of Principal	4.70%
% 30+ Days Past Due	23.10%
Purchased From SCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balance	221,064
Amount	14,152
% of Principal	6.40%
% 30+ Days Past Due	33.90%
All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balance	164,803
Amount	$ 3,973
% of Principal	2.40%
% 30+ Days Past Due	8.70%