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Fair Value Measurement (Assets Remeasured At Fair Value On Non-Recurring Basis) (Details) (Non-Recurring, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loss, Impaired mortgage loans held for investment $ (3,739) $ (10,663)
Total
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired mortgage loans held for investment 69,131 84,708
As a percentage of total assets 1.50% 1.90%
Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired mortgage loans held for investment 0 0
As a percentage of total assets 0.00% 0.00%
Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired mortgage loans held for investment 0 0
As a percentage of total assets 0.00% 0.00%
Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired mortgage loans held for investment $ 69,131 $ 84,708
As a percentage of total assets 1.50% 1.90%