Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance With Allowance	$ 48,093	$ 63,265
Balance With No Allowance	108,013	117,275
Total Impairment Loans	156,106	180,540
Related Allowance	11,233	17,303
Purchased From SCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance With Allowance	40,142	56,128
Balance With No Allowance	90,516	97,591
Total Impairment Loans	130,658	153,719
Related Allowance	7,992	14,917
All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance With Allowance	7,951	7,137
Balance With No Allowance	17,497	19,684
Total Impairment Loans	25,448	26,821
Related Allowance	$ 3,241	$ 2,386