Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014	Jul. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 115,660	$ 118,927	$ 136,372
Related Allowance	6,319	6,764	9,780
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	96,746	98,999	113,220
Related Allowance	5,211	3,239	7,396
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	18,914	19,928	23,152
Related Allowance	1,108	3,525	2,384
Balance With Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	32,598	33,100	39,691
Balance With Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	28,239	27,924	33,088
Balance With Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	4,359	5,176	6,603
Balance With No Allowance
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	83,062	85,827	96,681
Balance With No Allowance | Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	68,507	71,075	80,132
Balance With No Allowance | All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 14,555	$ 14,752	$ 16,549