Mortgage Loans Held For Investment And Related Assets (Schedule Of Past Due Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012		Apr. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Less than 60 Days Past Due	$ 28,307
60- 89 Days Past Due	4,213
90+ Days Past Due	83,187	[1]
Total Past Due	115,707
Current	270,160
Total	385,867		429,312
Purchased From SCC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Less than 60 Days Past Due	21,741
60- 89 Days Past Due	3,313
90+ Days Past Due	69,812	[1]
Total Past Due	94,866
Current	126,198
Total	221,064
All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Less than 60 Days Past Due	6,566
60- 89 Days Past Due	900
90+ Days Past Due	13,375	[1]
Total Past Due	20,841
Current	143,962
Total	$ 164,803

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