Mortgage Loans Held For Investment And Related Assets (Schedule Of Non-Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Apr. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable recorded investment non-accrual status	$ 91,996	$ 104,973
Financing receivable modifications to recorded investments	3,964	4,436
Total non-accrual loans	95,960	109,409
Purchased From SCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable recorded investment non-accrual status	76,235	88,347
Financing receivable modifications to recorded investments	3,460	3,166
All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable recorded investment non-accrual status	15,761	16,626
Financing receivable modifications to recorded investments	$ 504	$ 1,270