Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Apr. 30, 2014	Oct. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 111,114	$ 118,927	$ 127,606
Related Allowance	5,993	6,764	7,181
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	93,632	98,999	107,152
Related Allowance	4,984	3,239	5,762
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	17,482	19,928	20,454
Related Allowance	1,009	3,525	1,419
Balance With Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	29,226	33,100	35,296
Balance With Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	25,494	27,924	30,100
Balance With Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	3,732	5,176	5,196
Balance With No Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	81,888	85,827	92,310
Balance With No Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	68,138	71,075	77,052
Balance With No Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 13,750	$ 14,752	$ 15,258