Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 127,606	$ 142,916	$ 156,106
Related Allowance	7,181	8,686	11,233
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	107,152	118,383	130,658
Related Allowance	5,762	6,573	7,992
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	20,454	24,533	25,448
Related Allowance	1,419	2,113	3,241
Balance With Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	35,296	41,392	48,093
Balance With Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	30,100	33,791	40,142
Balance With Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	5,196	7,601	7,951
Balance With No Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	92,310	101,524	108,013
Balance With No Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	77,052	84,592	90,516
Balance With No Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 15,258	$ 16,932	$ 17,497