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Assets And Liabilities Measured At Fair Value (Fair Value Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Apr. 30, 2011
Jan. 31, 2011
Assets And Liabilities Measured At Fair Value [Abstract]      
Mortgage loans held for investment, Carrying Amount $ 430,189 $ 485,008  
Deposits, Carrying Amount 1,593,604    
Long-term borrowings, Carrying Amount 1,040,237 1,040,084 1,039,788
Mortgage loans held for investment, Estimated Fair Value 260,691    
Deposits, Estimated Fair Value 1,585,985    
Long-term borrowings, Estimated Fair Value $ 1,078,152