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Fair Value Measurement (Quantitative Information About Level 3 Fair Value Measurements) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2013
Third Party Pricing
REO
Apr. 30, 2013
Third Party Pricing
Minimum
REO
Apr. 30, 2013
Third Party Pricing
Maximum
REO
Apr. 30, 2013
Third Party Pricing
Weighted Average
REO
Apr. 30, 2013
Collateral-Based
Impaired Mortgage Loans Held For Investment - Non TDRs
Apr. 30, 2013
Collateral-Based
Impaired Mortgage Loans Held For Investment - TDRs
Apr. 30, 2013
Collateral-Based
Minimum
Impaired Mortgage Loans Held For Investment - Non TDRs
Apr. 30, 2013
Collateral-Based
Maximum
Impaired Mortgage Loans Held For Investment - Non TDRs
Apr. 30, 2013
Collateral-Based
Weighted Average
Impaired Mortgage Loans Held For Investment - Non TDRs
Apr. 30, 2013
Discounted Cash Flow
Impaired Mortgage Loans Held For Investment - Non TDRs
Apr. 30, 2013
Discounted Cash Flow
Minimum
Impaired Mortgage Loans Held For Investment - TDRs
Apr. 30, 2013
Discounted Cash Flow
Maximum
Impaired Mortgage Loans Held For Investment - TDRs
Apr. 30, 2013
Discounted Cash Flow
Weighted Average
Impaired Mortgage Loans Held For Investment - TDRs
Fair Value Inputs, Assets, Quantitative Information [Line Items]                                
Mortgage Loans on Real Estate $ 14,972 $ 19,532 $ 29,252 $ 13,968                        
Fair value                 $ 50,137       $ 84,093      
Cost to list/sell         5.00% 57.00% 6.00%     0.00% 45.00% 7.00%        
Loss severity         0.00% 100.00% 49.00%     0.00% 100.00% 58.00%   0.00% 21.00% 5.00%
Time to sell (in months)               24 years       24 months        
Collateral depreciation                   (24.00%) 100.00% 47.00%        
Aged default performance                           29.00% 50.00% 39.00%