Mortgage Loans Held For Investment And Related Assets (Schedule Of Non-Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	$ 83,600	$ 85,233	$ 97,717
Financing receivable modifications to recorded investments	3,747	4,221	3,907
Total non-accrual loans	87,347	89,454	101,624
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	68,740	70,327	81,539
Financing receivable modifications to recorded investments	3,247	3,719	3,398
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	14,860	14,906	16,178
Financing receivable modifications to recorded investments	$ 500	$ 502	$ 509