Mortgage Loans Held For Investment And Related Assets (Schedule Of Non-Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable recorded investment non-accrual status	$ 91,841	$ 104,973
Financing receivable modifications to recorded investments	4,282	4,436
Total non-accrual loans	96,123	109,409
Purchased From SCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable recorded investment non-accrual status	75,414	88,347
Financing receivable modifications to recorded investments	3,776	3,166
All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable recorded investment non-accrual status	16,427	16,626
Financing receivable modifications to recorded investments	$ 506	$ 1,270