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	6 Months Ended
	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Outstanding Principal Balance	$ 306,103	$ 350,235	$ 385,867
Loan Loss Allowance, Amount	12,704	14,314	18,125
Loan Loss Allowance, % of Principal	4.20%	4.10%	4.70%
% 30 Days Past Due	21.20%
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Outstanding Principal Balance	175,566
Loan Loss Allowance, Amount	10,236
Loan Loss Allowance, % of Principal	5.80%
% 30 Days Past Due	31.00%
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Outstanding Principal Balance	130,537
Loan Loss Allowance, Amount	$ 2,468
Loan Loss Allowance, % of Principal	1.90%
% 30 Days Past Due	8.00%