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Mortgage Loans Held For Investment And Related Assets (Schedule Of Mortgage Loans Held For Investment And The Related Allowance) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jan. 31, 2012
Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Outstanding Principal Balance $ 516,509 $ 572,974
Amount 89,949 92,087
% of Principal 17.40%  
% 30 + Days Past Due 34.20%  
Purchased From SCC [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Outstanding Principal Balance 324,122  
Amount 77,373  
% of Principal 23.90%  
% 30 + Days Past Due 47.10%  
All Other [Member]
   
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Outstanding Principal Balance 192,387  
Amount $ 12,576  
% of Principal 6.50%  
% 30 + Days Past Due 12.40%