Mortgage Loans Held For Investment And Related Assets (Schedule Of Past Due Mortgage Loans) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2012		Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	$ 429,312		$ 572,974
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	251,857
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	177,455
Less Than 60 Days Past Due [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	26,242
Less Than 60 Days Past Due [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	18,520
Less Than 60 Days Past Due [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	7,722
60 - 89 Days Past Due [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	7,454
60 - 89 Days Past Due [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	6,627
60 - 89 Days Past Due [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	827
90+ Days Past Due [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	99,614	[1]
90+ Days Past Due [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	85,303	[1]
90+ Days Past Due [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	14,311	[1]
Total Past Due [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	133,310
Total Past Due [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	110,450
Total Past Due [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	22,860
Current [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	296,002
Current [Member] | Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	141,407
Current [Member] | All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	$ 154,595

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