Mortgage Loans Held For Investment And Related Assets (Schedule Of Non-Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013	Oct. 31, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	$ 80,364	$ 85,233	$ 91,841
Financing receivable modifications to recorded investments	4,713	4,221	4,282
Total non-accrual loans	85,077	89,454	96,123
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	67,641	70,327	75,414
Financing receivable modifications to recorded investments	3,832	3,719	3,776
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	12,723	14,906	16,427
Financing receivable modifications to recorded investments	$ 881	$ 502	$ 506