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, 2011	Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	$ 537,754	$ 572,974
Related allowance	91,379	92,087
% of principal	17.00%
% 30 + Days past due	32.40%
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	336,689
Related allowance	78,517
% of principal	23.30%
% 30 + Days past due	44.70%
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	201,065
Related allowance	$ 12,862
% of principal	6.40%
% 30 + Days past due	11.70%