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	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Outstanding Principal Balance	$ 429,312	$ 572,974
Loan Loss Allowance, Amount	26,540	92,087
Loan Loss Allowance, % of Principal	6.20%
% 30 + Days Past Due	25.40%
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Outstanding Principal Balance	251,857
Loan Loss Allowance, Amount	22,109
Loan Loss Allowance, % of Principal	8.80%
% 30 + Days Past Due	36.70%
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Outstanding Principal Balance	177,455
Loan Loss Allowance, Amount	$ 4,431
Loan Loss Allowance, % of Principal	2.50%
% 30 + Days Past Due	9.30%