Mortgage Loans Held For Investment And Related Assets (Schedule Of Non-Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	$ 104,973	$ 157,464
Financing receivable modifications to recorded investments	4,436	3,178
Total non-accrual loans	109,409	160,642
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	88,347	143,358
Financing receivable modifications to recorded investments	3,166	2,849
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	16,626	14,106
Financing receivable modifications to recorded investments	$ 1,270	$ 329