Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013	Jan. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 121,922	$ 142,916	$ 152,794
Related Allowance	6,584	8,686	10,586
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	101,910	118,383	127,609
Related Allowance	5,341	6,573	8,470
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	20,012	24,533	25,185
Related Allowance	1,243	2,113	2,116
Balance With Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	33,067	41,392	45,695
Balance With Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	28,037	33,791	38,938
Balance With Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	5,030	7,601	6,757
Balance With No Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	88,855	101,524	107,099
Balance With No Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	73,873	84,592	88,671
Balance With No Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 14,982	$ 16,932	$ 18,428