Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	$ 166,671	$ 180,540
Related Allowance	14,484	17,303
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	139,903	153,719
Related Allowance	11,653	14,917
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	26,768	26,821
Related Allowance	2,831	2,386
Balance With Allowance [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	53,918	63,265
Balance With Allowance [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	45,719	56,128
Balance With Allowance [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	8,199	7,137
Balance Without Allowance [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	112,753	117,275
Balance Without Allowance [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	94,184	97,591
Balance Without Allowance [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio Balance	$ 18,569	$ 19,684