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Mortgage Loans Held For Investment And Related Assets (Schedule Of Past Due Mortgage Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio $ 516,509 $ 572,974
Purchased From SCC [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 324,122  
All Other [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 192,387  
Less Than 60 Days Past Due [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 37,299  
Less Than 60 Days Past Due [Member] | Purchased From SCC [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 28,876  
Less Than 60 Days Past Due [Member] | All Other [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 8,423  
60 - 89 Days Past Due [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 7,683  
60 - 89 Days Past Due [Member] | Purchased From SCC [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 6,159  
60 - 89 Days Past Due [Member] | All Other [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 1,524  
90 + Days Past Due [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 161,886 [1]  
90 + Days Past Due [Member] | Purchased From SCC [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 141,247 [1]  
90 + Days Past Due [Member] | All Other [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 20,639 [1]  
Total Past Due [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 206,868  
Total Past Due [Member] | Purchased From SCC [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 176,282  
Total Past Due [Member] | All Other [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 30,586  
Current [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 309,641  
Current [Member] | Purchased From SCC [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio 147,840  
Current [Member] | All Other [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Total Portfolio $ 161,801  
[1] We do not accrue interest on loans past due 90 days or more.