Mortgage Loans Held For Investment And Related Assets (Schedule Of Non-Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013	Jan. 31, 2013
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	$ 76,898	$ 85,233	$ 91,996
Financing receivable modifications to recorded investments	5,178	4,221	3,964
Total non-accrual loans	82,076	89,454	95,960
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	64,573	70,327	76,235
Financing receivable modifications to recorded investments	4,221	3,719	3,460
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loans receivable recorded investment non-accrual status	12,325	14,906	15,761
Financing receivable modifications to recorded investments	$ 957	$ 502	$ 504