Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 142,916	$ 180,540
Related Allowance	8,686	17,303
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	118,383	153,719
Related Allowance	6,573	14,917
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	24,533	26,821
Related Allowance	2,113	2,386
Balance With Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	41,392	63,265
Balance With Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	33,791	56,128
Balance With Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	7,601	7,137
Balance With No Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	101,524	117,275
Balance With No Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	84,592	97,591
Balance With No Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 16,932	$ 19,684