Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 136,372	$ 142,916	$ 166,671
Related Allowance	9,780	8,686	14,484
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	113,220	118,383	139,903
Related Allowance	7,396	6,573	11,653
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	23,152	24,533	26,768
Related Allowance	2,384	2,113	2,831
Balance With Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	39,691	41,392	53,918
Balance With Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	33,088	33,791	45,719
Balance With Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	6,603	7,601	8,199
Balance With No Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	96,681	101,524	112,753
Balance With No Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	80,132	84,592	94,184
Balance With No Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 16,549	$ 16,932	$ 18,569