Mortgage Loans Held For Investment And Related Assets (Schedule Of Non-Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	$ 168,572	$ 157,464
Financing receivable modifications to recorded investments	3,948	3,178
Total non-accrual loans	172,520	160,642
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	145,493	143,358
Financing receivable modifications to recorded investments	3,055	2,849
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	23,079	14,106
Financing receivable modifications to recorded investments	$ 893	$ 329