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Mortgage Loans Held for Investment and Related Assets (Schedule of Past Due Mortgage Loans) (Details) (USD $)
In Thousands
Apr. 30, 2011
Apr. 30, 2010
Portfolio balance $ 572,974 $ 683,684
Less Than 60 Days Past Due [Member]
   
Portfolio balance 47,621  
Less Than 60 Days Past Due [Member] | Purchased from SCC [Member]
   
Portfolio balance 37,371  
Less Than 60 Days Past Due [Member] | All Other [Member]
   
Portfolio balance 10,250  
60 To 89 Days Past Due [Member]
   
Portfolio balance 6,476  
60 To 89 Days Past Due [Member] | Purchased from SCC [Member]
   
Portfolio balance 4,882  
60 To 89 Days Past Due [Member] | All Other [Member]
   
Portfolio balance 1,594  
90 Days + Past Due [Member]
   
Portfolio balance 152,872 [1]  
90 Days + Past Due [Member] | Purchased from SCC [Member]
   
Portfolio balance 132,326 [1]  
90 Days + Past Due [Member] | All Other [Member]
   
Portfolio balance 20,546 [1]  
Total Past Due [Member]
   
Portfolio balance 206,969  
Total Past Due [Member] | Purchased from SCC [Member]
   
Portfolio balance 174,579  
Total Past Due [Member] | All Other [Member]
   
Portfolio balance 32,390  
Current [Member]
   
Portfolio balance 366,005  
Current [Member] | Purchased from SCC [Member]
   
Portfolio balance 183,235  
Current [Member] | All Other [Member]
   
Portfolio balance 182,770  
Purchased from SCC [Member]
   
Portfolio balance 357,814  
All Other [Member]
   
Portfolio balance $ 215,160  
[1] No loans past due 90 days or more are still accruing interest.