Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	$ 261,307	$ 268,649
Related allowance	81,303	80,849
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	225,765	232,061	[1]
Related allowance	72,465	71,733	[1]
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	35,542	36,588	[1]
Related allowance	8,838	9,116	[1]
Portfolio Balance With No Allowance [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	54,670	59,235
Portfolio Balance With No Allowance [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	45,369	51,674	[1]
Portfolio Balance With No Allowance [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	9,301	7,561	[1]
Portfolio Balance With Allowance [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	206,637	209,414
Portfolio Balance With Allowance [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	180,396	180,387	[1]
Portfolio Balance With Allowance [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	$ 26,241	$ 29,027	[1]

[1] Classification of amounts as of April 30, 2011 has been restated to conform to the current period presentation.