Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012		Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 180,540	[1]	$ 268,649	[2]
Related Allowance	17,303	[1]	80,849	[2]
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	153,719	[1]	232,061	[2]
Related Allowance	14,917	[1]	71,733	[2]
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	26,821	[1]	36,588	[2]
Related Allowance	2,386	[1]	9,116	[2]
Balance With No Allowance [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	117,275	[1]	59,235	[2]
Balance With No Allowance [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	97,591	[1]	51,674	[2]
Balance With No Allowance [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	19,684	[1]	7,561	[2]
Balance With Allowance [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	63,265	[1]	209,414	[2]
Balance With Allowance [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	56,128	[1]	180,387	[2]
Balance With Allowance [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Impaired Loans Balance	$ 7,137	[1]	$ 29,027	[2]

[1] Changes as compared to the prior year are primarily a result of the charge-off of loans 180 days past due in the current year, as previously discussed.

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