Mortgage Loans Held For Investment And Related Assets (Schedule Of Past Due Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013		Apr. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Less than 60 Days Past Due	$ 23,920
60- 89 Days Past Due	4,173
90+ Days Past Due	82,836	[1]
Total Past Due	110,929
Current	261,210
Total	372,139		429,312
Purchased From SCC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Less than 60 Days Past Due	16,752
60- 89 Days Past Due	3,084
90+ Days Past Due	69,905	[1]
Total Past Due	89,741
Current	122,509
Total	212,250
All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Less than 60 Days Past Due	7,168
60- 89 Days Past Due	1,089
90+ Days Past Due	12,931	[1]
Total Past Due	21,188
Current	138,701
Total	$ 159,889

[1] We do not accrue interest on loans past due 90 days or more.