Mortgage Loans Held For Investment And Related Assets (Schedule Of Non-Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	$ 166,136	$ 157,464
Financing receivable modifications to recorded investments	7,011	3,178
Total non-accrual loans	173,147	160,642
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	142,853	143,358
Financing receivable modifications to recorded investments	5,729	2,849
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	23,283	14,106
Financing receivable modifications to recorded investments	$ 1,282	$ 329